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Selina solutions for Concise Chemistry Class 10 ICSE chapter 7 - Metallurgy [Latest edition]

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Concise Chemistry Class 10 ICSE - Shaalaa.com

Chapter 7: Metallurgy

Exercise - 7AExercise - 7BExercise - 7CExercise - 7DMiscellaneous Exercise

Selina solutions for Concise Chemistry Class 10 ICSE Chapter 7 Metallurgy Exercise Exercise - 7A [Pages 123 - 124]

Exercise - 7A | Q 1.1 | Page 123

Name the three classes in which elements are classified. Which was the first metal used by man?

Exercise - 7A | Q 1.2 | Page 123

Name the metal and non-metal present in abudance in the earth crust.

Exercise - 7A | Q 2.1 | Page 123

Name the metal which is a constituent of Blood pigment ?

Exercise - 7A | Q 2.2 | Page 123

Name the metal which is a constituent of plant pigment ?

Exercise - 7A | Q 3.1 | Page 123

Give the importance of the following in living being Nitrogen ?

Exercise - 7A | Q 3.2 | Page 123

Give the importance of the following in living being Hydrogen ?

Exercise - 7A | Q 3.3 | Page 123

Give the importance of the following in living being carbon ?

Exercise - 7A | Q 4.1 | Page 123

State the position of the following in the periodic table:

Alkali metals

Exercise - 7A | Q 4.2 | Page 123

State the position of the following in the periodic table:

Alkaline earth metals

Exercise - 7A | Q 4.3 | Page 123

State the position of the following in the periodic table:

Halogens

Exercise - 7A | Q 4.4 | Page 123

State the position of the following in the periodic table:

Aluminium

Exercise - 7A | Q 5.1 | Page 123

Name:

a liquid non-metal

Exercise - 7A | Q 5.2 | Page 123

Name: two metalloids

Exercise - 7A | Q 5.3 | Page 123

Name: metal which does not corrode easily

Exercise - 7A | Q 5.4 | Page 123

Name:

Two metals which react with cold water

Exercise - 7A | Q 5.5 | Page 123

Name : a non-metal which can form a positive ion

Exercise - 7A | Q 5.6 | Page 123

Name:

A non-metal which shows reducing property

Exercise - 7A | Q 6 | Page 123

From the list of characteristics given below, select the five which are relevant to non-metals and their compounds:

  1. Ductile
  2. Conduct electricity
  3. Brittle
  4. Acidic Oxides
  5. Basic Oxides
  6. Discharged at anode
  7. Discharged at cathode
  8. Ionic chlorides
  9. Covalent chlorides
  10. Reaction with dilute sulphuric acid yields hydrogen
  11. 1,2 or 3 valence electrons
  12. 5,6 ,7 valence electrons

(Write the five letters corresponding to the correct characteristics).

Exercise - 7A | Q 7.1 | Page 124

Why are alkali metals kept in kerosene oil?

Exercise - 7A | Q 7.2 | Page 124

Why is hydrogen kept in the metal activity series?

Exercise - 7A | Q 7.3 | Page 124

Why do gold ornaments look new even after several years of use? 

Exercise - 7A | Q 8.1 | Page 124

From the metals: copper iron, magnesium, sodium, and zinc, select a different metal in the case which:

does not react with dilute hydrochloric acid

Exercise - 7A | Q 8.2 | Page 124

From the metals: copper iron, magnesium, sodium, and zinc, select a different metal in the case which:

can form 2 + and 3 + ions

Exercise - 7A | Q 8.3 | Page 124

From the metals: copper iron, magnesium, sodium, and zinc, select a different metal in the case which:

Arrange the above metals in the decreasing order of reactivity.

Exercise - 7A | Q 9.1 | Page 124

Which metal occurs as: A sulphide also give the name of their respective ore.

Exercise - 7A | Q 9.2 | Page 124

Which metal occurs as: A halide also give the name of their respective ore.

Exercise - 7A | Q 9.3 | Page 124

Which metal occurs as: A carbonate also give the name of their respective ore.

Exercise - 7A | Q 9.4 | Page 124

Which metal occurs as: An oxide also give the name of their respective ore.

Exercise - 7A | Q 10.1 | Page 124

Distinguish between:

a mineral and an ore

Exercise - 7A | Q 10.2 | Page 124

Distinguish between:

an ore and a metallic compound

Exercise - 7A | Q 11.1 | Page 124

Which metal can be extracted from the following ore.

bauxite

Exercise - 7A | Q 11.2 | Page 124

Which metal can be extracted from the following ore.

Calamine

Exercise - 7A | Q 11.3 | Page 124

Which metal can be extracted from the following ore.

haematite

Exercise - 7A | Q 12.1 | Page 124

Explain the following term : ore

Exercise - 7A | Q 12.2 | Page 124

Explain the following term:

gangue 

Selina solutions for Concise Chemistry Class 10 ICSE Chapter 7 Metallurgy Exercise Exercise - 7B [Pages 123 - 129]

Exercise - 7B | Q 1.1 | Page 129

Give the principles of:

hydrolytic method

Exercise - 7B | Q 1.2 | Page 129

Give the principles of:

froth floatation process

Exercise - 7B | Q 1.3 | Page 123

Give the principles of:

electromagnetic separation

Exercise - 7B | Q 2.1 | Page 129

Name the methods by which concentrated ore is converted to metallic oxide.

Exercise - 7B | Q 2.2 | Page 129

State three objectives achieved during the roasting of ores.

Exercise - 7B | Q 3.1 | Page 129

Name : The processes involved in (i) dressing of the ores (ii) refining of ores . 

Exercise - 7B | Q 3.2 | Page 129

Two metallic oxides which cannot be reduced by carbon, carbon monoxide or hydrogen.

Exercise - 7B | Q 4 | Page 129

Why does iron or zinc not occur free in nature?

Exercise - 7B | Q 5 | Page 129

What do you observe when hydrogen is passed over heated copper oxide?

Exercise - 7B | Q 6 | Page 129

Compare roasting and calcination.

Exercise - 7B | Q 7.1 | Page 129

 Name an ore of zinc ?

Exercise - 7B | Q 7.2 | Page 129

which process is applied to concentrate it?

Exercise - 7B | Q 7.3 | Page 129

How is concentrated ore changed to oxide?

Exercise - 7B | Q 8.1 | Page 129

Some metallic oxides can be reduced by hydrogen, carbon and carbon monoxide and some cannot. explain

Exercise - 7B | Q 8.2 | Page 129

Write a balanced equation for the reduction of copper (ll) oxide by hydrogen.

Exercise - 7B | Q 9.1 | Page 129

How are the following metallic oxides reduced? Write equations:

Iron (ll) oxide

Exercise - 7B | Q 9.2 | Page 129

How are the following metallic oxides reduced? Write the equation:

Zinc oxide.

Exercise - 7B | Q 10 | Page 129

State why aluminium is extracted from its oxide by electrolysis while copper, lead, iron by reducing agents and mercury and silver by thermal decomposition.

Exercise - 7B | Q 11 | Page 129

An ore on being heated in air forms sulphurous anhydride. Write the process used for the concentration of this ore.

Exercise - 7B | Q 12.1 | Page 129

Define roasting. Name an ore on which roasting is done. Give balanced equation.

Exercise - 7B | Q 12.2 | Page 129

Define calcination. Give example and equation for calcination.

Exercise - 7B | Q 13 | Page 129

How are metals like sodium, potassium, and calcium obtained? Give equations.

Exercise - 7B | Q 14.1 | Page 129

Give the equation for the reduction of Copper oxide

Exercise - 7B | Q 14.2 | Page 129

Give equation for the reduction of Iron (III) oxide

Exercise - 7B | Q 14.3 | Page 129

Give equation for the reduction of Lead (II) oxide

Exercise - 7B | Q 14.4 | Page 129

Give equation for the reduction of Zinc oxide

Exercise - 7B | Q 15.1 | Page 129

on which factors does purification of metals depend?

Exercise - 7B | Q 15.2 | Page 129

name the methods used for purification ?

Exercise - 7B | Q 15.3 | Page 129

With a labelled diagram explain electro-refining of a particular metal.

Exercise - 7B | Q 16.1 | Page 129

Choose the correct option :

The metal other than aluminium, which has a strong affinity for oxygen is:

  • Copper

  • Magnesium

  • Silver

  • Gold

Exercise - 7B | Q 16.2 | Page 129

Choose the correct option:

A metallic oxide which cannot be reduced by normal reducing agents:

  • Zinc oxide

  • Magnesium oxide

  • Copper(II) oxide

  • Iron(III) oxide

Exercise - 7B | Q 17.1 | Page 129

Fill in the blanks:

Usually …………. (sulphide/carbonate) ores are subjected to ……………. (calcination/roasting) which is done in the absence of air.

Exercise - 7B | Q 17.2 | Page 129

Fill in the blanks:

Zinc blend is converted to oxide by ……… (roasting/calcination) process.

Exercise - 7B | Q 17.3 | Page 129

Fill in the blanks:

Froath floatation process is generally used to concentrate ………… ores (sulphide/carbonate).

Selina solutions for Concise Chemistry Class 10 ICSE Chapter 7 Metallurgy Exercise Exercise - 7C [Pages 132 - 133]

Exercise - 7C | Q 1 | Page 132

State the position of aluminium in the periodic table.

Exercise - 7C | Q 2.1 | Page 132

Give the chemical names and formulae of the main ores of (i) aluminium, (ii) iron and (iii) zinc.

Exercise - 7C | Q 2.2 | Page 132

Which impurities are present in bauxite ?

Exercise - 7C | Q 2.3 | Page 132

What is red mud, how is it removed?

Exercise - 7C | Q 3.1 | Page 132

In order to obtain 1 tonne of aluminium the following inputs are required. 4 tonnes 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 (III) oxide, Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite

♦ when bauxite is treated with sodium hydroxide solution, what happens to
(i) the aluminium oxide
(ii) the iron (III) oxide

Exercise - 7C | Q 3.2 | Page 132

In order to obtain 1 tonne of aluminium the following inputs are required. 4 tonnes 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 (III) oxide, Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite

(i) Name the process used for the purification of bauxite
(ii) Write the equation for the action of heat on aluminium hydroxide

Exercise - 7C | Q 3.3 | Page 132

In order to obtain 1 tonne of aluminium the following inputs are required. 4 tonnes 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 (III) oxide, Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite

  1. Write the formula of cryolite.
  2. Write down the word which correctly completes the following sentence. By dissolving aluminium oxide in cryolite a (conducting/non-conducting) solution is produced.
  3. Why is so much graphite required for the electrolytic process?
  4. Write the equation for the reaction which takes place at the cathode.
  5. What is cathode made up of?
Exercise - 7C | Q 4.1 | Page 132

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 equation for the purification of bauxite ?

Exercise - 7C | Q 4.2 | Page 132

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 chemical used for dissolving aluminium oxide, In which state is the chemical used?

Exercise - 7C | Q 4.3 | Page 132

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 - 7C | Q 5 | Page 132
  1. A to F below relate to the source and extraction of either zinc or aluminium:
  2. Bauxite
  3. Coke
  4. Cryolite
  5. Froth floatation
  6. Sodium hydroxide solution
  7. Zinc blende
  8. Write down the three letters each from the above list which are relevant to
  9. Zinc
  10. Aluminium
  11. Fill in the blanks using the most appropriate words from A to F.
  12. The ore from which aluminium is extracted must first be treated with ………………. so that pure aluminium oxide can be obtained.
  13. Pure aluminium oxide is dissolved in ….. to make a conducting solution.

 iii. Write the formula of cryolite.

Exercise - 7C | Q 6.1 | Page 133

Explain with reason: 

In the electrolytic reduction of alumina, the graphite anode is gradually consumed.

Or

Why the anode has to be replaced from time to time in this process?

Exercise - 7C | Q 6.2 | Page 133

Explain with reason:

Roasting is carried out on sulphide ores and not on carbonate ores?

Exercise - 7C | Q 6.3 | Page 133

Carbon can reduce lead oxide but not aluminium oxide ?

Exercise - 7C | Q 6.4 | Page 133

Electrolytic reduction is done to obtain aluminium?

Exercise - 7C | Q 6.5 | Page 133

Explain the reason :

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

Exercise - 7C | Q 6.6 | Page 133

Explain with reason:

A neutral gas other than oxygen is formed at the anode during electrolysis of fused alumina.

Exercise - 7C | Q 6.7 | Page 133

Why is powdered coke sprinkled on top of the electrolyte? 

Exercise - 7C | Q 7.1 | Page 133

For substance listed below, explain its significance in the extraction of aluminium.

bauxite

Exercise - 7C | Q 7.2 | Page 133

For substance listed below, explain its significance in the extraction of aluminium.

Sodium hydroxide

Exercise - 7C | Q 7.3 | Page 133

For substance listed below, explain its significance in the extraction of aluminium.

Cryolite

Exercise - 7C | Q 7.4 | Page 133

For substance listed below, explain its significance in the extraction of aluminium.

Graphite

Exercise - 7C | Q 8 | Page 133

Distinguish between electrolytic methods of reduction and refining ?

Exercise - 7C | Q 9 | Page 133

Give three ways in which the metal zinc differs from the non-metals carbon. At least one of the differences must be a chemical difference ?

Exercise - 7C | Q 10.1 | Page 133

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

Exercise - 7C | Q 10.2 | Page 133

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

Exercise - 7C | Q 11.1 | Page 133

Fill in the blanks:

During the concentration of bauxite ore, aluminium goes in ………. (soluble/insoluble) part because of its …………(acidic/basic/amphoteric) nature.

Exercise - 7C | Q 11.2 | Page 133

Fill in the blank:

In Hoope's process, pure aluminium is collected at the …………… of the electrolytic cell.

  • top

  • bottom

Selina solutions for Concise Chemistry Class 10 ICSE Chapter 7 Metallurgy Exercise Exercise - 7D [Page 136]

Exercise - 7D | Q 1.1 | Page 136

Explain the following : 

zinc is used to cover iron so as to prevent rusting of iron. why?

Exercise - 7D | Q 1.2 | Page 136

In construction work, why is the alloy of aluminium - duralumin used rather than pure aluminium?

Exercise - 7D | Q 2 | Page 136

What is an alloy? How do the properties of an alloy differ from its constituents?

Exercise - 7D | Q 3 | Page 136

Both brass and bronze contain copper as major constituents. Name other elements in these alloys.

Exercise - 7D | Q 4.1 | Page 136

Name an alloy of:

aluminium used in aircraft construction

Exercise - 7D | Q 4.2 | Page 136

Name an alloy of:

lead used in electrical wiring or electrical work in joining metals.

Exercise - 7D | Q 4.3 | Page 136

Name an alloy of:

copper in electrical appliances or household vessels

Exercise - 7D | Q 4.4 | Page 136

Name an alloy of:

zinc used in naval ships

Exercise - 7D | Q 5 | Page 136

What is an amalgam? State its use with an example ?

Exercise - 7D | Q 6.1 | Page 136

state two properties of brass that render it more useful for some purpose than its components?

Exercise - 7D | Q 6.2 | Page 136

a metal which forms a liquid alloys at ordinary temperature  ?

Exercise - 7D | Q 7.1 | Page 136

Name the constituents of:

Duralumin

Exercise - 7D | Q 7.2 | Page 136

Name the constituents of:

solder,

Exercise - 7D | Q 7.3 | Page 136

Name the constituents of:

Bronze

Exercise - 7D | Q 7.4 | Page 136

Name the constituents of:

Brass

Exercise - 7D | Q 8.1 | Page 136

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

Exercise - 7D | Q 8.2 | Page 136

Name the following:

A metal which is always present in the amalgam.

Exercise - 7D | Q 8.3 | Page 136

Name the following :

The Process of heating an ore to a high temperature in the presence of air.

Exercise - 7D | Q 8.4 | Page 136

Name the following : 

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

Exercise - 7D | Q 8.5 | Page 136

A compound that is added to lower the fusion temperature of the electrolytic bath in the extraction of aluminium.

Exercise - 7D | Q 8.6 | Page 136

Name the following :

Name an allotrope of a non-metal that allows electricity to pass through it.

Exercise - 7D | Q 9.1 | Page 136

Choose the correct answer:
Brass is an alloy of

  • Copper and tin

  • Copper and zinc

  • Zinc and lead

  • Lead and tin

Exercise - 7D | Q 9.2 | Page 136

Steel is an alloy of iron and :

  • Nickel

  • Zinc

  • Carbon

  • Aluminium

Exercise - 7D | Q 9.3 | Page 136

Choose the correct answer from the options given below : 
The reason for using Aluminium in the alloy duralium is :

  • Aliminium is brittle

  • Aliminium gives strength 

  • Aluminium brings lightness

  • Aluminium lowers melting point 

Exercise - 7D | Q 10.1 | Page 136

Name the alloy used for the following purpose.

Making electric circuits

Exercise - 7D | Q 10.2 | Page 136

Name the alloy used for the following purpose.

Making medals

Exercise - 7D | Q 10.3 | Page 136

Name the alloy used for the following purpose.

Making parts of watches

Exercise - 7D | Q 10.4 | Page 136

Name the alloy used for the following purpose.

Surgical instruments

Exercise - 7D | Q 10.5 | Page 136

Name the alloy used for the following purpose.

Aircraft

Selina solutions for Concise Chemistry Class 10 ICSE Chapter 7 Metallurgy Exercise Miscellaneous Exercise [Page 139]

Miscellaneous Exercise | Q 1 | Page 139

The following is an extract from 'Metals in the service of Man, Alexander and street /Pelican 1976':
'Alumina (aluminium oxide) 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 for the reaction which occurs at the anode when aluminium is purified by electrolysis.

Miscellaneous Exercise | Q 2 | Page 139

The following is a sketch of an electrolytic cell used in the extraction of aluminium :

(a) What is the substance of which the electrode A and B are made?
(b) At which electrode (A or B) is aluminium formed?
(c) What are the two aluminium compounds in the electrolyte C?
(d) Why is it necessary for electrode B to be continuously replaced?

Miscellaneous Exercise | Q 3 | Page 139

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

Use of metal Property
Zinc in Galvanization  
Aluminium in Thermite welding  
Miscellaneous Exercise | Q 4.1 | Page 139

Answer the following question:

Name a metal which is found abundantly in the Earth's crust.

Miscellaneous Exercise | Q 4.2 | Page 139

Answer the following question:

What is the difference between calcination and roasting?

Miscellaneous Exercise | Q 4.3 | Page 139

Answer the following question:

Name the process used for the enrichment of sulphide ore.

Miscellaneous Exercise | Q 4.4 | Page 139

Answer the following question:

Write the chemical formula of one main ore of iron and aluminium.

Miscellaneous Exercise | Q 4.5 | Page 139

Answer the following question:

Write the constituents of the electrolyte for the extraction of aluminium.

Chapter 7: Metallurgy

Exercise - 7AExercise - 7BExercise - 7CExercise - 7DMiscellaneous Exercise
Concise Chemistry Class 10 ICSE - Shaalaa.com

Selina solutions for Concise Chemistry Class 10 ICSE chapter 7 - Metallurgy

Selina solutions for Concise Chemistry Class 10 ICSE 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 Concise Chemistry Class 10 ICSE 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. Selina textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Concise Chemistry Class 10 ICSE 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, Concept of Metals and Non-metals, Corrosion of Iron and Its Prevention, Position of the Metals (Alkali Metals and Alkaline Earth Metals) in the Periodic Table.

Using Selina 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 Selina Solutions are important questions that can be asked in the final exam. Maximum students of CISCE Class 10 prefer Selina Textbook Solutions to score more in exam.

Get the free view of chapter 7 Metallurgy Class 10 extra questions for Concise Chemistry Class 10 ICSE and can use Shaalaa.com to keep it handy for your exam preparation

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