Share
Notifications

View all notifications
Books Shortlist
Your shortlist is empty

# Selina solutions for Class 10 Chemistry chapter 7 - Metallurgy

## Selina ICSE Concise Chemistry for Class 10

Login
Create free account

Forgot password?

## Chapter 7 : Metallurgy

#### Page 0

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

Name:

the most abundant metal and the most abundant non=metal

Name the metal which is a constituent of Blood pigment ?

Name the metal which is a constituent of plant pigment ?

Give the importance of the following in living being Nitrogen ?

Give the importance of the following in living being Hydrogen ?

Give the importance of the following in living being carbon ?

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

Define metal and non-metal on the basis of electron loss or gain.

State the position of the following in the periodic table:

Alkali metals,

State the position of the following in the periodic table:

Alkaline earth metals

State the position of the following in the periodic table:

Iron and zinc

State the position of the following in the periodic table:

Aluminium

Give the general characteristics of:

Alkali metals,

(i) bonding
(ii) action of air
(iii) action of water
(iv) action of acid

Give the general characteristics of:

Alkaline earth metals with reference to

(i) bonding
(ii) action of air
(iii) action of water
(iv) action of acid

What are metalloids: Give examples.

Why is hydrogen placed with alkali metals?

Name:

a liquid non-metal,

Name:

a metal with dull appearance

Name:

a metal with low melting and boiling points

Name:

a non-metal with high m.p & b.p

Name:

a metal which can float on water

Name:

a metal which can be cut with a knife.

Name:

a metal which is a bad conductor of heat and electricity

Name:

a non-metal which is ductile

Name:

a non- metal used in alloys

Name:

a non-malleable metal

Distinguish between metals and non metals on the basis of:
(i) ion formation, (ii) discharge of ions, (iii) nature of oxide formed, (iv) oxidizing and reducing property, (v) reaction with acids.

Na _____ → Na^+

N+—→ N^3-

Cl +e- →  —

Mg -—  → Mg^(2+)

M+ HCl →  MCl_2 +—

Mg +H_2SO_4 → —+ —

Select from the following ist:

Fe_2O_3, , NO, PbO, Mn_2O_7

Basic oxide………..

Select from the following ist:

Fe_2O_3, , NO, PbO, Mn_2O_7

Amphoteric oxide …………

Select from the following ist:

Fe_2O_3, , NO, PbO, Mn_2O_7

Acidic oxide ………………

Select from the following ist:

Fe_2O_3, , NO, PbO, Mn_2O_7

Neutral oxide ……………..

Take an element from an alkali metal and one from an alkaline earth metal and write an equation  for their action with:

Hydrochloric acid,

Take an element from an alkali metal and one from an alkaline earth metal and write an equation for their action with:

Oxygen

Take an element from an alkali metal and one from an alkaline earth metal and write an equation for their action with:

Sulphuric acid

Take an element from an alkali metal and one from an alkaline earth metal and write an equation for their action with:

Water.

#### Page 0

Name:

Two metals which are liquid at room temperature

Name:

two metals which are soft

Name:
a metal which lacks ductility

Name:

a non metal which is lustrous

Name:

a non metal which conducts electricity

Name:

a metal which is brittle

Name:

two non metals which are monoatomic

Name:

two metallic oxides which are acidic

Name:

two metallic oxides which are amphoteric

Name:

two metals which react with cold water,

Name:

the compound responsible for green deposit on the surface of copper

Name:

a non metal which can form a positive ion

Name:

a non-metal which shows reducing property

Name:

a metal whose oxide is reduced only by carbon

Explain how the activity series accounts for  the following:

occurrence of metals

Explain how the activity series accounts for each of the following:

tendency to corrosion

Explain how the activity series accounts for each of the following:

reaction with water

Explain how the activity series accounts for each of the following:

reaction with acids

Give the balanced reactions for the following:

Sodium is dropped in water

Give the balanced reactions for the following:

Magnesium reacts with boiling water

Give the balanced reactions for the following:

Red hot iron reacts with steam

Give the balanced reactions for the following:

Iron reacts with dilute HCI

Give a short account of heating effect on metal carbonates based on the activity series ?

Why are alkali metals kept in kerosene oil?

Why are alkali metals kept in kerosene oil?

brown powder deposit on iron?

Give the effect of heat on metal oxides based on the activity series ?

Metal A has an electronic configuration of 2, 8, 1 and metal B has 2, 8, 8, 2 which is more reactive metal.

Identify A and B and give their reactions with dil HCL and dil H2SO4 ?

Metal A has an electronic configuration of 2, 8, 1 and metal B has 2, 8, 8, 2 which is more reactive metal.

Give the effect of heat on their ?

(i) oxides

Metal A has an electronic configuration of 2, 8, 1 and metal B has 2, 8, 8, 2 which is more reactive metal.

Give the effect of heat on their:

(iv) nitrates

Metal A has an electronic configuration of 2, 8, 1 and metal B has 2, 8, 8, 2 which is more  reactive metal.

Give the effect of heat on their:

(ii) hydroxide

Metal A has an electronic configuration of 2, 8, 1 and metal B has 2, 8, 8, 2 which is more reactive metal.

Give the effect of heat on their:

(iii) carbonates

The table below compares some properties of metals and non-metals. Write down the missing
statements (i) to (iv) :

 Metals Non-metals (i) ………………….. Poor conductors of heat (ii) Malleable …………………… (iii) Form positive ions …………………… (iv) ………………… Form acidic oxides

How many valence electrons are present in:

(ii) non-metals?

How many valence electrons are present in:

(i) metals and

What is corrosion? What are necessary conditions for corrosion?

State under what conditions corrosion is faster ?

Corrosion can be an advantage in some case.Explain ?

What is rust? Give the equation for the formation of rust ?

State two conditions necessary for rusting of iron ?

How does the painting of an iron object prevent rusting?

What is galvanization? How does it protect iron from rusting?

A student has been collecting silver coins and copper coins. One day she observed a black
coating on silver coins and a green coating on copper coins. Which chemical phenomenon is
responsible for these coatings? Write the names of black and green coatings.

Aluminium is said to be more reactive than iron, towards oxygen (or air) yet iron undergoes corrosion to a greater extent than aluminum. Explain.

Which metals do not corrode easily?

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

#### Page 0

Define the term ‘metallurgy’. State the processes involved in metallurgy ?

Also give the names of their repective ores ?

Distinguish between:

a mineral and an ore,

Distinguish between:

an ore and a metallic compound

Which metal can be extracted from each one of the following ores.

(a) bauxite

Which metal can be extracted from each one of the following ores.

(b) calamine

Which metal can be extracted from each one of the following ores.

(c) haematite

State three objectives achieved during the roasting of ores ?

Give the principles of:

hydrolytic method ?

Give the principles of:

froth floatation ?

Give the principles of:

electromagnetic separation

Name:
(a) the processes involved in
concentration :-

Name:
the processes involved in
refining of ores :-

Name:

(b) two metallic oxides which cannot be reduced by carbon, carbon monoxide or hydrogen

Explain the following terms:

(a) flux

Explain the following terms:

gangue :

Explain the following terms:

(c) slag

Explain the following terms:

smelting

Why does iron or zinc not occur free in nature?

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

Compare roasting and calcination

Name an ore of zinc ?

which process is applied to concentrate it?

How is concentrated ore changes to oxide?

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

How are the following metallic oxides reduced. Write equations:

(a) Iron

How are the following metallic oxides reduced. Write equations:

(b) Zinc oxide.

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

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

on which factors does purification of metals depend?

name the methods used for purification ?

How is electro-refining done?

Ag2O................................

MnO_2 + 4Al  …………….

Cu (OH)2................................

ZnCO_3..............................

2NaNO_3......................

2Pb(NO3)_2.........................

2AgNO_3 ...........................

2Cu_2O +Cu_2S ......................

HgS + O_2 ..................

#### Page 0

State the position of aluminium in the periodic table.

Give the chemical names and formulae of any three ores of aluminium.

Which impurities are present in bauxite ?

What is red mud, how is it removed?

Why electrolytic reduction is done to obtain aluminium?

Give the ionization reactions of electrolyte used in Hall’s process. write the reaction at the cathode and the anode. Why the anode has to be replaced in this process?

Name the process by which the refining of aluminium is done ?

Where are the cathode and anode in the electrolytic cell? Name the material used for these?

state the reactions at the two electrodes ?

How does aluminum react with the Air ?

How does aluminum react with the Water ?

How does aluminum react with the Acid ?

How does aluminum react with the Base ?

What is the role of cryolite (Na_3AIF_6) in the electrolytic reduction of alumina in Hall’s process?

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

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

Give the name and formula of the main orea of iron and zinc ?

How is the main ore of aluminium concentrated?

Why ‘the food containing iron salts’ should not be cooked in aluminium utensils?

Explain with reasons:

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

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

Carbon can reduce lead oxide but not aluminium oxide ?

Why is flux used in the blast furnace?

what does it form with silica present in the ore?

How is it removed?

Name an ore which is concentrated by:

forth floatation process

Name an ore which is concentrated by:

magnetic separation

Distinguish between electrolytic methods of reduction and refining ?

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 ?

#### Page 0

State a reason why zinc is used in:

galvanization,

State a reason why zinc is used in:

dry cells

State a reason why zinc is used in:

cosmetics?

State on what special properties the use of each of these metals depends:

aluminium

State on what special properties the use of each of these metals depends:

zinc

Explain

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

Explain

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

Explain

Nitric acid can be stored in aluminium containers

State the use of:

cast iron

State the use of:

cast iron

State the use of:

wrought Iron

State the use of:

Mild steel,

State the use of:

hard steel

Which metal is used for:

making pipes, buckets, water tanks,

Which metal is used for:

lithographic plates for printing

Which metal is used for:

making face creams

Give reasons, why aluminum is used in:

making alloys

Give reasons, why aluminum is used in:

wrapping chocolates

Give reasons, why aluminum is used in:

painting electric and telegraphic poles

Give reasons, why aluminum is used in:

In aluminiothermy

Give reasons, why aluminum is used in:

In making ships

Aluminum is used in thermite welding:

what is thermit?

Aluminum is used in thermite welding:

what is ignition mixture?

Aluminum is used in thermite welding:

write reaction for process?

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

Name three alloys of steel. Give their compositions and uses.

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

Name an alloy of:

aluminium used in aircraft construction

Name an alloy of:

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

Name an alloy of:

copper in electrical appliances or household vessels

Name an alloy of:

zinc used in simple voltaic cells

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

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

a metal which forms a liquid alloys at ordinary temperature  ?

What is magnalium? Name the main elements present in it? Write its one use ?

Name the constituents of:

Duralumin

Name the constituents of:

solder,

Name the constituents of:

Bronze

Name the constituents of:

Invar

#### Page 0

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

bauxite

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

Sodium hydroxide

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

Cryolite

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

Graphite

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

does not react with dilute hydrochloric acid

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

can form 2 + and 3 + ions

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

has a hydroxide that reacts with both acids and alkalis

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

for not react with cold water but reacts with steam when heated.

Arrange the metals in (2) in the decreasing order of reactivity.

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

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

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) write the formulae of cryolite
(ii) Write down the word which correctly completes the following sentences.
By dissolving aluminium oxide in cryolite a ………. (conducting/non conducting) solution
is produced.
(iii) why is so much graphic required for the electrolytic process?
(iv) Write the equation for the reaction which takes place at cathode.

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

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

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 ?

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 of subdivision is the chemical used?

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 ?

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 ?

## Selina solutions for Class 10 Chemistry chapter 7 - Metallurgy

Selina 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 Selina ICSE Concise Chemistry for Class 10 solutions in a manner that help students grasp basic concepts better and faster.

Further, we at shaalaa.com are providing 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 Class 10 Chemistry chapter 7 Metallurgy are Concept of Metallurgy, 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, Corrosion of Iron and Its Prevention, Extraction of Metals, Reduction of Metallic Oxides, Physical Properties - Non Metal, Physical Properties - Metal, Comparison of Metals and Non-metals, Position of the Metals (Alkali Metals and Alkaline Earth Metals) in the Periodic Table, Concept of Metals and Non-metals.

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 Chemistry and can use shaalaa.com to keep it handy for your exam preparation

S