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Frank Frank Class 10 Chemistry Part 2

Frank Class 10 Chemistry Part 2 - Shaalaa.com

Chapter 7: Metallurgy

Exercise

Chapter 7: Metallurgy Exercise Exercise solutions [Page 179]

Exercise | Q 1.01 | Page 179

Name the following:
Two metals which are found in the free or native state.

Exercise | Q 1.02 | Page 179

Name the following:
The mixture of materials fed into a furnace to extract a metal.

Exercise | Q 1.03 | Page 179

Name the following:
The rocky impurities present in an ore.

Exercise | Q 1.04 | Page 179

Name the following:
The substance added to get rid of gangue in the extraction of metal.

Exercise | Q 1.05 | Page 179

Name the following:
The process of heating a substance very strongly in such a way that it does not combine with oxygen.

Exercise | Q 1.06 | Page 179

Name the following:
The process in which an ore is heated in air so that oxygen gets added to it to form the oxides.

Exercise | Q 1.07 | Page 179

Name the following :
Ore of iron referred to as "fool's gold".

Exercise | Q 1.08 | Page 179

Name the following:
The chief ore of aluminium.

Exercise | Q 1.09 | Page 179

Name the following:  
The substance added along with aluminium in the Hall-Heroult's process.

Exercise | Q 1.1 | Page 179

Name the following:
The materials used as electrodes in the electrolytic extraction of aluminium.

Exercise | Q 1.11 | Page 179

Name the following:
The kind of welding in which aluminium powder is used.

Exercise | Q 1.12 | Page 179

Name the following:
The chief metal which occur in nature in free state as well as in combined state.

Exercise | Q 1.13 | Page 179

Name the following:
The chief metal present in magnalium and duralumin

Exercise | Q 1.14 | Page 179

Name the following:
Two metals which occur in nature in free state as well as in combined state.

Exercise | Q 1.15 | Page 179

Name the following:
Name two metals always find in combined state.

Exercise | Q 2.1 | Page 179

Give reason for the following:
Zinc is used in galvanization and dry cells.

Exercise | Q 2.2 | Page 179

Give reason for the following:
Nitric acid can be stored in aluminium containers.

Exercise | Q 2.3 | Page 179

Give reason for the following:
Aluminium oxide cannot be reduced by carbon.

Exercise | Q 2.4 | Page 179

Give reason for the following:
A neutral gas other than oxygen is formed at the anode during electrolysis of fused alumina.

Exercise | Q 2.5 | Page 179

Give reason for the following:
Extraction of aluminium was very difficult in the beginning.

Exercise | Q 2.6 | Page 179

Give reason for the following:
Carbon anodes are used in the electrolytic extraction of aluminium.

Exercise | Q 2.7 | Page 179

Give reason for the following:
Galvanized metal ions should not be used for storing food.

Exercise | Q 3.1 | Page 179

Define the term : Mineral

Exercise | Q 3.2 | Page 179

Define the term : Ore

Exercise | Q 3.3 | Page 179

Define the term : Gangue

Exercise | Q 3.4 | Page 179

Define the term : Charge

Exercise | Q 3.5 | Page 179

Define the term : Flux

Exercise | Q 3.6 | Page 179

Define the term : Slag

Chapter 7: Metallurgy Exercise Exercise solutions [Page 180]

Exercise | Q 1.1 | Page 180

What is meant by concentration of ores?

Exercise | Q 1.2 | Page 180

Name the process of concentration
(a) Based on densities
(b) Based on magnetic nature.

Exercise | Q 1.3 | Page 180

How an ore is concentrated by froth floatation process?

Exercise | Q 2.1 | Page 180

Name one metal occurring as a : Sulphide ore

Exercise | Q 2.2 | Page 180

Name one metal occurring as a : Halide ore

Exercise | Q 2.3 | Page 180

Name one metal occurring as a : Carbonate ore

Exercise | Q 2.4 | Page 180

Name one metal occurring as a : Oxide ore

Exercise | Q 3 | Page 180

Comment on the statement that- "All ores are minerals but all minerals are not ores".

Exercise | Q 4.1 | Page 180

Write the name and formula of two ores of the following: Iron

Exercise | Q 4.2 | Page 180

Write the name and formula of two ores of the following: Zinc

Exercise | Q 4.3 | Page 180

Write the name and formula of two ores of the following: Aluminium

Exercise | Q 5 | Page 180

Compare the process of calcination and roasting.

Exercise | Q 6 | Page 180

What is meant by refining of metals? Name the three common methods used for refining.

Exercise | Q 7 | Page 180

How are metals refined by the electrolytic methods?

Exercise | Q 8.1 | Page 180

Name the ore from which aluminium is extracted.

Exercise | Q 8.2 | Page 180

How is ore purified (give equations also)

Exercise | Q 8.3 | Page 180

How is aluminium obtained from pure ore?

Exercise | Q 8.4 | Page 180

Which method of refining is used to get 99.8% pure aluminium?

Exercise | Q 9.1 | Page 180

In the Hall's process for extraction of aluminium, Give the formula and purpose of fluorspar and cryolite

Exercise | Q 9.2 | Page 180

In the Hall's process for extraction of aluminium, Sate the location of cathode and anode and explain what occurs at each electrode.

Exercise | Q 10 | Page 180

What is the role of cryolite (NaAlF6) in the electrolytic reduction of alumina in the Hall's process?

Exercise | Q 11.1 | Page 180

Aluminium is a more active metal than iron, but suffers less corrosion. Why?

Exercise | Q 11.2 | Page 180

Explain and give reasons why aluminium vessels should not be cleaned with powders containing alkalis.

Exercise | Q 11.3 | Page 180

Why is food containing iron salts should not be cooked in aluminium utensils?

Exercise | Q 12.1 | Page 180

Give equation for the following conversion:  Ferric oxide to iron.

Exercise | Q 12.2 | Page 180

Give equation for the following conversion: Aluminium hydroxide to aluminium oxide.

Exercise | Q 12.3 | Page 180

Give equation for the following conversion: Aluminium to aluminium nitride.

Exercise | Q 12.4 | Page 180

Give equation for the following conversion:Aluminium to sodium aluminate.

Exercise | Q 13 | Page 180

What is an alloy? Give three reasons why alloys are made.

Exercise | Q 14 | Page 180

Give two properties of alloys which are different from constituent metals.

Exercise | Q 15 | Page 180

What is an amalgam? Name one metal which does not form amalgam? State one use of amalgam.

Exercise | Q 16.1 | Page 180

Give composition and uses of the following alloys. Mention the reason for its use.
Stainless steel

Exercise | Q 16.2 | Page 180

Give composition and uses of the following alloys. Mention the reason for its use.
Duralumin

Exercise | Q 16.3 | Page 180

Give composition and uses of the following alloys. Mention the reason for its use.
Brass

Exercise | Q 16.4 | Page 180

Give composition and uses of the following alloys. Mention the reason for its use.
Magnalium

Exercise | Q 16.5 | Page 180

Give composition and uses of the following alloys. Mention the reason for its use.
Solder

Exercise | Q 16.6 | Page 180

Give composition and uses of the following alloys. Mention the reason for its use.
Bronze

Exercise | Q 17.1 | Page 180

Explain the following:
Galvanization protects iron from rusting.

Exercise | Q 17.2 | Page 180

Explain the following:
Stainless steel is more useful than steel.

Exercise | Q 17.3 | Page 180

Explain the following:  
Aluminium is extensively used for making aircraft parts.

Exercise | Q 17.4 | Page 180

Explain the following:
Cold water has no action on aluminium.

Exercise | Q 18.1 | Page 180

Complete and balance the following equation:
Al + O2

Exercise | Q 18.2 | Page 180

Complete and balance the following equation:
Al + N2 → 

Exercise | Q 18.3 | Page 180

Complete and balance the following equation:
Al + KOH + H2O →

Exercise | Q 18.4 | Page 180

Complete and balance the following equation:
Fe2O3 + → Al2O3 +

Exercise | Q 18.5 | Page 180

Complete and balance the following equation:
Fe2O+ CO →

Exercise | Q 19.1 | Page 180

Name oxide of one metal which is reduced by (give equation): Reduction with carbon

Exercise | Q 19.2 | Page 180

Name oxide of one metal which is reduced by (give equation): Electrolytic reduction

Exercise | Q 19.3 | Page 180

Name oxide of one metal which is reduced by (give equation): Reduction with heat alone

Chapter 7: Metallurgy Exercise Exercise solutions [Page 181]

Exercise | Q 1.1 | Page 181

An aqueous solution of sodium chloride is not used for electrolytic reduction of sodium metal. Why?

Exercise | Q 1.2 | Page 181

For the reaction of a metal oxide. Suggest a reducing agent other than carbon

Exercise | Q 2.1 | Page 181

What is galvanized iron.

Exercise | Q 2.2 | Page 181

What is passive iron?

Exercise | Q 3 | Page 181

Name the alloy of zinc used in simple voltaic cells.

Exercise | Q 4 | Page 181

Complete and balance the following equation :
Al + NaOH →

Exercise | Q 5.1 | Page 181

Give the chemical name and formula of 'cryolite'

Exercise | Q 5.2 | Page 181

what is the function of cryolite in the extraction of aluminium, other than acting as a solvent for bauxite?

Exercise | Q 6.1 | Page 181

Name a non-metallic element which forms acidic and neutral oxides

Exercise | Q 6.2 | Page 181

Name a non-metallic element which has a metallic lustre

Exercise | Q 6.3 | Page 181

Name a non-metallic element which is a liquid at ordinary temperatures

Exercise | Q 6.4 | Page 181

Name a non-metallic element which is a conductor of electricity.

Exercise | Q 7 | Page 181

Name a metal which occurs free in nature.

Chapter 7: Metallurgy Exercise Exercise solutions [Page 182]

Exercise | Q 1.1 | Page 182

Give the name and formula of an ore of zinc.: 
Roasting of the ore

Exercise | Q 1.2 | Page 182

Give the name and formula of an ore of zinc.
Reduction of the zinc compound which is the product of above reaction.

Exercise | Q 1.3 | Page 182

Give the name and formula of an ore of zinc.
What in addition to a zinc compound, is put into the furnace? State one large scale use of zinc.

Exercise | Q 2 | Page 182

Arrange the metals:
calcium, iron, magnesium and sodium in order of their reactivity with water placing the most reactive first.

Exercise | Q 3 | Page 182

Write equations for each of the above metal which reacts with water.

Exercise | Q 4.1 | Page 182

The following question refer to the extraction of aluminium and iron from their ores :
Name the principle ore from which i. iron, and ii. Aluminium is extracted.

Exercise | Q 4.2 | Page 182

The following question refer to the extraction of aluminium and iron from their ores:
What is the most important chemical process in the extraction of any metal? State how this essential step is carried out in the extraction of: i. iron, and ii. Aluminium.

Exercise | Q 4.3 | Page 182

The following question refer to the extraction of aluminium and iron from their ores:
Iron and aluminum ores both, contain impurities. Explain briefly how these impurities are removed in each case.

Exercise | Q 4.4 | Page 182

The following question refer to the extraction of aluminium and iron from their ores:
What is the major impurity present in iron when it is removed from the furnace?

Exercise | Q 5 | Page 182

Name an alloy of zinc which is used in simple voltaic cells.

Exercise | Q 6.1 | Page 182

For the substance listed below, explain its role in the extraction of aluminium: Bauxite

Exercise | Q 6.2 | Page 182

For the substance listed below, explain its role in the extraction of aluminium: Sodium hydroxide

Exercise | Q 6.3 | Page 182

For the substance listed below, explain its role in the extraction of aluminium: Cryolite

Exercise | Q 6.4 | Page 182

For the substance listed below, explain its role in the extraction of aluminium: Graphite

Exercise | Q 7.1 | Page 182

The following question relate to the extraction of aluminium by electrolysis.
Give the equation for the reaction which takes place at the cathode.

Exercise | Q 7.2 | Page 182

The following questions relate to the extraction of aluminium by electrolysis.
Explain why it is necessary to renew the anode periodically.

Exercise | Q 8.1 | Page 182

What is an alloy? An alloy usually has some property which makes it useful in a specific way.
What is the special property of: Duralumin

Exercise | Q 8.2 | Page 182

What is an alloy? An alloy usually has some property which makes it useful in a specific way.
What is the special property of : type metal?

Exercise | Q 9 | Page 182

What is added to steel to make it stainless steel?

Exercise | Q 10 | Page 182

Define and explain the meaning of the term ore.

Exercise | Q 11.1 | Page 182

Complete the incomplete statement with missing words:
Metals are ______ while non-metals are ______ conductors of heat.

Exercise | Q 11.2 | Page 182

Complete the incomplete statement with missing word:
Metals are malleable while non-metals are ______.

Exercise | Q 11.3 | Page 182

Complete the incomplete statement with missing word:
Metals form positive ions while non- metals ______.

Exercise | Q 11.4 | Page 182

Complete the incomplete statement with missing word:
Non-metals form acidic oxides while metals form ______.

Chapter 7: Metallurgy Exercise Exercise solutions [Page 183]

Exercise | Q 1.1 | Page 183

Name : The metal which is liquid at room temperature.

Exercise | Q 1.2 | Page 183

Name:
The allotrope of the non-metal carbon which conducts electricity.

Exercise | Q 2.1 | Page 183

How many valence electrons are present in metals ?

Exercise | Q 2.2 | Page 183

How many valence electrons are present in non- metals?

Exercise | Q 3 | Page 183

With reference to the reduction of copper (II) oxide , iron (II) oxide, lead (II) oxide and magnesium oxide; place the oxides in order of increasing ease of reduction.[i.e. first write the oxide that is most difficult to reduce and at last, the oxide, that is most easily reduced.]

Exercise | Q 4.1 | Page 183

Write balanced equation for the following reaction:
Reduction of copper oxide by hydrogen.

Exercise | Q 4.2 | Page 183

Write balanced equation for the following reaction:
Reduction of iron (III) oxide by carbon monoxide.

Exercise | Q 4.3 | Page 183

Write balanced equation for the following reaction:
Reduction of lead (II) oxide by carbon.

Exercise | Q 5.1 | Page 183

What is the type of bonding expected in a metallic chloride?

Exercise | Q 5.2 | Page 183

If fused metallic chloride is electrolyzed, at which electrode would the metal be obtained?

Exercise | Q 5.3 | Page 183

What metallic property is shown by the non-metal graphite?

Exercise | Q 6 | Page 183

X is an element in the form of a powder. X burns in oxygen and the product is soluble in water. The solution is tested with litmus. Write down only the word which will correctly complete each of the following sentences:
(a) If X is a metal, then the litmus will turn ______.
(b) If X is a non-metal, then the litmus will turn ______.
(c) If X is a reactive metal, then ______ will be evolved, when X reacts with dilute sulphuric acid.
(d) If X is a non -metal, it will form _ oxide, which will form ______ solution with water.
(e) If X is a non -metal, it will not conduct electricity unless it is carbon in the form of ______.

Exercise | Q 7 | Page 183

From  the metals copper, iron, magnesium, sodium and zinc, select a different metal in each case which:
(a) Does not react with dilute hydrochloric acid
(b) Can form 2+ and 3+ ions
(c) Has a hydroxide that reacts with both acid and alkalis.
(d) Does not react with cold water, but reacts with steam when heated.

Exercise | Q 8 | Page 183

Arrange the metals of copper, iron, magnesium, sodium and zinc in the decreasing order of reactivity.

Exercise | Q 9 | Page 183

List 1 contains the meta ls I alloys (1, 2, 3, 4, 5 ) and list 2 contains their uses (A, B, C, D, E).

List 1
Metal/Alloy
List 2
Uses
1. Aluminium A. Steel making
2. Lead B. aeroplane wings
3. Brass C. galvanizing
4. Iron D. radiation shield
5. Zinc E. electricaI fittings

Copy and complete the following table, write down the correct letter against the numbers representing metals. An answer may be used only once. The first has been done for you.

Metal 1 2 3 4 5
Use B        

Chapter 7: Metallurgy Exercise Exercise solutions [Page 184]

Exercise | Q 1.1 | Page 184
In order to obtain one tone of aluminium, the following inputs are required:
4 tones of bauxite, 150 Kg of sodium hydroxide and 600 Kg of graphite.
The aluminium compound in bauxite is aluminium oxide and the main impurity is iron (II) oxide. Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite.
(a) When bauxite is treated with sodium hydroxide solution, what happens to:
(i) the aluminium oxide?
(ii) The iron (III) oxide?
Exercise | Q 1.2 | Page 184

In order to obtain one tone of aluminium, the following inputs are required:
4 tones of bauxite, 150 Kg of sodium hydroxide and 600 Kg of graphite.
The aluminium compound in bauxite is aluminium oxide and the main impurity is iron (II) oxide. Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite.
(i) Name the process used for purification of bauxite.
(ii) Write the equation to show the action of heat on aluminium hydroxide.

Exercise | Q 1.3 | Page 184

In order to obtain one tone of aluminium, the following inputs are required:
4 tones of bauxite, 150 Kg of sodium hydroxide and 600 Kg of graphite.
The aluminium compound in bauxite is aluminium oxide and the main impurity is iron (II) oxide. Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite.
(i) Write the formula of cryolite.
(ii) Write down the word which correctly completes the following sentence.
"By dissolving aluminium oxide in cryolite, a ______ (conducting / non- conducting) solution is produced.
(iii) Why so much graphite required for this electrolytic process.
(iv) Write the equation for the reaction which takes place at cathode.

Exercise | Q 1.4 | Page 184

In order to obtain one tone of aluminium, the following inputs are required:
4 tones of bauxite, 150 Kg of sodium hydroxide and 600 Kg of graphite.
The aluminium compound in bauxite is aluminium oxide and the main impurity is iron (II) oxide. Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite.
In construction work, why is the alloy of aluminium, duralumin used rather than pure aluminium.

Exercise | Q 2 | Page 184

Compare the properties of a typical metal and a non- metal on the basis of the following:
(a) electronic configuration
(b) nature of oxides
(c) oxidizing or reducing action
(d) conductivity of heat and electricity

Exercise | Q 3 | Page 184

Name a non- metal that has a metallic luster and sublimes on heating.

Exercise | Q 4 | Page 184

Write balanced equation for the following reaction:
Aluminium powder is warmed with hot and concentrated caustic soda solution.

Exercise | Q 5 | Page 184

Name the ore of zinc containing its sulphide.

Exercise | Q 6.1 | Page 184

Write the equation for the reaction of zinc with following: Sodium hydroxide solution

Exercise | Q 6.2 | Page 184

Write the equation for the reaction of zinc with following: Dilute sulphuric acid

Exercise | Q 6.3 | Page 184

Write the equation for the reaction of zinc of the following: Copper sulphate solution

Chapter 7: Metallurgy Exercise Exercise solutions [Page 185]

Exercise | Q 1 | Page 185

To protect iron from rusting, it is coated with a thin layer of zinc. Name the process.

Exercise | Q 2.1 | Page 185

Aluminium is extracted from its chief ore bauxite. The ore is first purified and then the metal is extracted from it by electrolytic reduction.
Write three balanced equations for the purification of bauxite by Hall's process.

Exercise | Q 2.2 | Page 185

Aluminium is extracted from its chief ore bauxite. The ore is first purified and then the metal is extracted from it by electrolytic reduction.
Name a chemicals used for dissolving aluminium oxide. In which state of sub-division is the chemical used?

Exercise | Q 2.3 | Page 185

Aluminium is extracted from its chief ore bauxite. The ore is first purified and then the metal is extracted from it by electrolytic reduction.
Write an equation for the reaction which takes place at the anode during the extraction of aluminium by the electrolytic process.

Exercise | Q 2.4 | Page 185

Aluminium is extracted from its chief ore bauxite. The ore is first purified and then the metal is extracted from it by electrolytic reduction.
Mention one reason for the use of aluminium in thermite welding. Which particular property of cast iron makes it unsuitable for the construction of bridges?

Exercise | Q 3.1 | Page 185

A to F below relate to the source and extraction of either zinc or aluminium.
A. Bauxite
B. Coke
C. Cryolite
D. Froth floatation
E. Sodium hydroxide solution
F. Zinc blende
Write down the three letters each from the above list which are relevant to:
(i) Zinc
(ii) Aluminium

Exercise | Q 3.2 | Page 185

A to F below relate to the source and extraction of either zinc or aluminium.
A. Bauxite
B. Coke
C. Cryolite
D. Froth floatation
E. Sodium hydroxide solution
F. Zinc blende
Fill in the blanks using the most appropriate words from A to F:
(i) The ore from which aluminium is extracted must be treated with ______ so that pure aluminium oxide can be obtained.
(ii) Pure aluminium oxide is dissolved in ______ to make a conducting solution.

Exercise | Q 3.3 | Page 185

A to F below relate to the source and extraction of either zinc or aluminium.
A. Bauxite
B. Coke
C. Cryolite
D. Froth floatation
E. Sodium hydroxide solution
F. Zinc blende
Write the formula of cryolite.

Exercise | Q 4 | Page 185

Calcium, copper, lead, aluminium, zinc, chromium, magnesium, iron.
Choose the major metals from the list given above to make the following alloys:
(a) Stainless steel
(b) brass

Exercise | Q 5.1 | Page 185

Name the following:
A metal which is liquid at room temperature.

Exercise | Q 5.2 | Page 185

Name the following:
A compound which is added to lower the fusion temperature of the electrolytic bath in the extraction of aluminium.

Exercise | Q 5.3 | Page 185

Name the following:
The process of heating an ore to a high temperature in the presence of air.

Exercise | Q 5.4 | Page 185

Name the following:
The compound formed by the reaction between calcium oxide and silica.

Exercise | Q 5.5 | Page 185

Name the following:
The middle region of the blast furnace.

Exercise | Q 6 | Page 185

The following is an extract from 'Metals in the service of Man, Alexander and street /Pelican 1976':
'Alumina has a very high melting point of over 2000oC so that it cannot readily be liquefied. However, conversion of alumina to aluminium and oxygen, by electrolysis, can occur when it is dissolved in some other substance'.
(a) Which solution is used to react with bauxite as a first step in obtaining pure aluminium oxide?
(b) The aluminium oxide for the electrolytic extraction of aluminium is obtained by heating aluminium hydroxide. Write the balanced chemical equation for this reaction.
(c) Name the element which serves both as the anode and the cathode in the extraction of aluminium.
(d) Write the balanced chemical equation for the reaction that occurs at the cathode during the extraction of aluminium by electrolysis.
(e) Give the balanced chemical equation fro the reaction which occurs at the anode when aluminium is purified by electrolysis.

Chapter 7: Metallurgy Exercise Exercise solutions [Page 186]

Exercise | Q 1.1 | Page 186

Find the odd one out of the following and explain your choice.
Sulphur, Phosphorous, Carbon, Iodine

Exercise | Q 1.2 | Page 186

Find the odd one out of the following and explain your choice : Copper, Lead, Zinc, Mercury

Exercise | Q 2.1 | Page 186

Correct the following statement :
Copper reacts with nitric acid to produce nitrogen dioxide.

Exercise | Q 2.2 | Page 186

Correct the following statement :
Haematite is the chief ore of aluminium.

Exercise | Q 3 | Page 186

The sketch below illustrates the refin ing of aluminium by Hoope's process

(a) Which of A and B is th e cathode and which one is the anode?
(b) What is the electroly te in the tank?
( c) What material is used for th e cathode?

Exercise | Q 4 | Page 186

State the property of the metal being utilized in the following :

Use of metal Property
Zinc in Galvanization  
Aluminium in Thermite welding  
Exercise | Q 5 | Page 186

Choose the correct answer:
Brass is an alloy of

  • Copper and tin

  • Copper and zinc

  • Zinc and lead

  • Lead and tin

Chapter 7: Metallurgy Exercise Exercise solutions [Page 187]

Exercise | Q 1.1 | Page 187

Which one of the following is not true of metal :
Metals are good conductors of electricity.

  • True

  • False

Exercise | Q 1.2 | Page 187

Which one of the following is not true of metal :
 Metals are malleable and ductile

  • True

  • False

Exercise | Q 1.3 | Page 187

Which one of the following is not true of metal :
Metals form non-polar covalent compounds

  • True

  • False

Exercise | Q 1.4 | Page 187

Which one of the following is not true of metal :
Metal will have 1 or 2 or 3 electrons in their valence shell.

  • True

  • False

Exercise | Q 2.1 | Page 187

Name the main constituent metal in the following alloy:
Duralumin

Exercise | Q 2.2 | Page 187

Name the main constituent metal in the following alloy:
Brass

Exercise | Q 2.3 | Page 187

Name the main constituent metal in the following alloy:
Stainless steel

Exercise | Q 3 | Page 187

Choose the correct answer from the options given below:
The metal is a liquid at room temperature.

  • Potassium

  • Zinc

  • Gold

  • Mercury

Exercise | Q 4.1 | Page 187

Answer the following question :
Name a metal which is found abundantly in earth's crust.

Exercise | Q 4.2 | Page 187

Answer the following question :
What is the difference between calcination and roasting.

Exercise | Q 4.3 | Page 187

Answer the following question :
Name the process used for the enrichment of sulphide ore.

Exercise | Q 4.4 | Page 187

Answer the following question : 
Write the chemical formulae of main ore iron and aluminum.

Exercise | Q 4.5 | Page 187

Answer the following question :
Write the constituents of electrolyte for the extraction of aluminum.

Exercise | Q 5 | Page 187
  X Y
Normal Electronic Configuration 2,8,7 2,8,2
Nature of Oxide

Dissolves in water  and truns blue litmus red.

Very low solublity in water. Dissolves in hydrochloric acid
Tendency for Oxidising and reducing reactions Tends to oxidise elements and compound Tends to act as a reducing agent
Electrical and Thermal Conductivity Very poor electrical conductor Poor thermal conductivity Good electrical conductor Good thermal conductor
Tendency to form Alloys and Amalgams No tendency to form alloys Forms alloys

Using the information above, complete the following :
(i) _________ is the metallic element.
(ii) Metal atoms tend to have a maximum of ________ electrons in the outermost energy level.
(iii) Non-metallic elements tend to form _________ oxides while metals tend to form _______oxides.
(iv) Non-metallic elements tend to be ______ conductors of heat and electricity.
(v) Metals tend to _______ electrons and act as ________ agents in their reactions with elements and compounds.

Chapter 7: Metallurgy Exercise Exercise solutions [Page 188]

Exercise | Q 1 | Page 188

The metals zinc and tin are present in the alloy

  • Solder

  • Brass

  • Bronze

  • Duralumin

Exercise | Q 2.1 | Page 188

The following question relate to the extraction of aluminium by electrolysis.
Name the other aluminium containing compound added to alumina and state the significance.

Exercise | Q 2.2 | Page 188

The following question relate to the extraction of aluminium by electrolysis.
Give the equation for the reaction that takes place at the cathode

Exercise | Q 2.3 | Page 188

The following question relate to the extraction of aluminium by electrolysis.
Explain why is it necessary to renew the anode periodically.

Exercise | Q 3.1 | Page 188

State the main components of the following alloy :
Brass

Exercise | Q 3.2 | Page 188

State the main components of the following alloy :
Duralumin

Exercise | Q 3.3 | Page 188

State the main components of the following alloy : Bronze

Exercise | Q 4.1 | Page 188

Name the following.
The property possessed by metals by which they can be beaten into sheets.

Exercise | Q 4.2 | Page 188

Name the following : 
A compound added to lower the fusion temperature of electrolytic bath in the extracton of aluminium.

Exercise | Q 4.3 | Page 188

Name the following: 
The ore of zinc containing its sulphide.

Exercise | Q 5 | Page 188

The main ore used for the extraction of iron is

  • Haematite 

  • Calamine

  • Bauxite

  • Cryolite

Exercise | Q 6 | Page 188

Heating an ore in a limited supply of air or in the absence of air at a temperature just below its melting point is known as

  • Smelting

  • Ore dressing

  • Calcination

  • bessemerisation

Exercise | Q 7 | Page 188

Aluminium powder is used in thermite welding because

  • It is a strong reducing agent

  • It is a strong oxidizing agent

  • It is corrosion resistant

  • It is a good conductor of heat

Exercise | Q 8 | Page 188

This is not an alloy of copper:

  • Brass

  • Bronze

  • Solder

  • Durlamium 

Exercise | Q 9.1 | Page 188

Describe the role played in the extraction of aluminum:
Cryolite

Exercise | Q 9.2 | Page 188

Describe the role played in the extraction of aluminum:
Sodium hydroxide

Exercise | Q 9.3 | Page 188

Describe the role played in the extraction of aluminum : Graphite

Exercise | Q 10.1 | Page 188

Explain why : 
In the electrolysis of alumina using the Hall Heroult's Process the electrolyte is covered with powdered coke.

Exercise | Q 10.2 | Page 188

Explain why :
Iron sheets are coated with zinc during galvanization.

Chapter 7: Metallurgy Exercise Exercise solutions [Page 189]

Exercise | Q 1.1 | Page 189

 Name the solution used to react with bauxite as a first step in obtaining pure aluminium oxide,in the Baeyer's process.

Exercise | Q 1.2 | Page 189

Write the equation for the reaction where the aluminium oxide for the electrolytic extraction of aluminium is obtained by heating aluminium hydroxide.

Exercise | Q 1.3 | Page 189

Name the compound added to pure alumina to lower the fusion temperature during the electrolytic reduction of alumina.

Exercise | Q 1.4 | Page 189

Write the equation for the reaction that occurs at the cathode during the extraction by aluminium by electrolysis.

Exercise | Q 1.5 | Page 189

Explain why it is preferably to use a number of graphite electrodes as anode instead of a single electrode, during the above electrolysis.

Exercise | Q 2 | Page 189

The two main metals in bronze are

  • Copper and zinc

  • Copper and lead

  • Copper and nickel

  • Copper and tin

Exercise | Q 3.1 | Page 189

Name the following :
The process of coating of iron with zinc.

Exercise | Q 3.2 | Page 189

Name the following :
An alloy of lead and tin that is use in electrical circuits.

Exercise | Q 3.3 | Page 189

Name the following :  
An ore of zinc containing its sulphide.

Exercise | Q 3.4 | Page 189

Name the following :
A metal oxide that can be reduced by hydrogen

Exercise | Q 4.1 | Page 189

Answer the following question with respect by hydrogen : Identify the components of the electrolyte other than pure alumina and the role played by each.

Exercise | Q 4.2 | Page 189

Answer the following question with respect by hydrogen : 
Explain why powdered coke is sprinkled over than electrolytic mixture.

Exercise | Q 5.1 | Page 189

Complete the following by selecting the correct option from the choices given:
The metal which does not react with water or dilute H2SO4 but reacts with concentrated H2SO4 is _________

  • Al

  • Cu

  • Zn

  • Fe

Exercise | Q 5.2 | Page 189

Complete the following by selecting the correct option from the choices given :
The metal whose oxide, which is amphoteric, is reduced to metal by carbon reduction ________

  • Fe

  • Mg

  • Pb

  • Al

Exercise | Q 5.3 | Page 189

Complete the following by selecting the correct option from the choices given :
The diavalent metal whose oxide is reduced to metal by electrolysis of its fused salt is ________

  • Al

  • Na

  • Mg

  • K

Exercise | Q 6.1 | Page 189

choose the most appropriate term to match the given description.
Crushing of the ore into a fine powder

  • Calcination

  • roasting

  • pulverization

  • smelting

Exercise | Q 6.2 | Page 189

choose the most appropriate term to match the given description.
Heating of the ore in the absence of air to high temperature

  • Calcination

  • roasting

  • pulverization

  • smelting

Chapter 7: Metallurgy

Exercise

Frank Frank Class 10 Chemistry Part 2

Frank Class 10 Chemistry Part 2 - Shaalaa.com

Frank solutions for Class 10 Chemistry chapter 7 - Metallurgy

Frank solutions for Class 10 Chemistry chapter 7 (Metallurgy) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CISCE Frank Class 10 Chemistry Part 2 solutions in a manner that help students grasp basic concepts better and faster.

Further, we at Shaalaa.com provide such solutions so that students can prepare for written exams. Frank textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Class 10 Chemistry chapter 7 Metallurgy are Chemical Method - NaOH for Purifying Bauxite – Baeyer’s Process, Dressing of the Ore, Extraction of Aluminium, Common Ores of Iron, Aluminium and Zinc, Extracting Metals Towards the Top of the Activity Series, Extracting Metals in the Middle of the Activity Series, Extracting Metals Low in the Activity Series, Extraction of Metals, Reduction of Metallic Oxides, Concept of Metallurgy.

Using Frank Class 10 solutions Metallurgy exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in Frank Solutions are important questions that can be asked in the final exam. Maximum students of CISCE Class 10 prefer Frank Textbook Solutions to score more in exam.

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