Extraction of Iron

Q.

Why do we apply paint on articles made up of iron?

Q.

The most abundant metal in the earth crust is___.

1. Al

2. Fe

3. O

4. Cu

Q. On heating green coloured ferrous sulphate crystals, a reddish brown solid is left out and the smell of a gas having the odour of burning sulphur is obtained. Identify the type of reaction involved.

1. Combustion
2. Thermal Decomposition
3. Electrolytic Decomposition
4. Displacement

Q.

What is blister copper

Q.

List some uses of iron in our everyday life.

Q.

How is carbon monoxide formed ?

Q. Arrange the zones in increasing order of their temperature in the blast furnace during extraction of Fe.

1. Oxide-reduction
2. Slag formation
3. Fusion
4. Combustion

Q. What is the colour of ${\text{FeSO}}_4.7{\text{H}}_2\text{O}$ crystals? How does this colour change upon heating and what are the products formed?

Q.

State the major difference between the composition of steel and stainless steel. Why is stainless steel considered better than steel?

Q.

When copper ore is mixed with silica in a reverberatory furnace, copper matte is formed. The copper matte contains __.

1. sulphides of Cu(II) and iron(II)

2. sulphides of Cu(II) and iron(III)

3. sulphides of Cu(I) and iron(III)

4. sulphides of Cu(I) and iron(II)

Q.

The percentage of carbon in cast iron varies from

1. $0.5\text{to}1$

2. $1\text{to}1.7$

3. $0.1\text{to}0.5$

4. $1.7\text{to}4.5$

Q.

Why is iron not extracted by electrolysis?

Q.

Answer the Following Question: Process Costing Is Suitable for

1. Hospitals

2. Oil Refining Firms

3. Transport Firms

4. Brick Laying Firms

Q.

What are the methods used for making alloys?

Q.

What is Auto Reduction Reaction?

Q.

In the process of extraction of iron from iron pyrite ore, which of the following process is/are used for concentration of ore?

1. Magnetic separation.
2. Gravity separation.
3. Froth flotation.
4. Leaching.

Q.

The raw materials required for the extraction of iron from haematite are (i) …….. (ii) ……… and hot air. The mineral present in haematite is (iii) ………. Which is reduced by (iv) ………. To iron.

Q.

Which of the Following Process Involves Smelting?

1. $2\mathrm{PbS}+3{\mathrm{O}}_2\to 2{\mathrm{PbO}}_2+2{\mathrm{SO}}_2$

2. ${\mathrm{Al}}_2{\mathrm{O}}_3.2{\mathrm{H}}_2\mathrm{O}\to {\mathrm{Al}}_2{\mathrm{O}}_3+2{\mathrm{H}}_2\mathrm{O}$

3. ${\mathrm{Fe}}_2{\mathrm{O}}_3+\mathrm{CO}\to 2\mathrm{Fe}+2{\mathrm{CO}}_2$

4. ${\mathrm{Cr}}_2{\mathrm{O}}_3+2\mathrm{Al}\to {\mathrm{Al}}_2{\mathrm{O}}_3+2\mathrm{Cr}+\mathrm{Heat}$

Q.

What is Curie temperature of Ferromagnetic material?

Q. Sulphuric acid is manufactured by the Contact process.
(a) Give two balanced equations to obtain $S{O}_2$ in this process.
(b) Give the conditions for the oxidation of $S{O}_2$.
(c) Why is $H_{2}S{O}_4$ not obtained by directly reacting $S{O}_3$ with water?
(d) Name the chemical used to dissolve $S{O}_3$ and name also the product formed.
(e) Give all the main reactions to this process.
[5 MARKS]

Q.

The galvanised article is protected against rusting even if the zinc coating is broken. Why and how?

Q.

The pressure, the temperature, and the catalyst used in the reaction are also indicated in the chemical equation by writing them above or below the arrow sign.

1. True
2. False

Q. The molten iron has 4% carbon and other impurities like manganese, silicon, phosphorus, etc. This is called:

1. Wrought iron
2. Pig iron
3. Raw iron
4. Cast iron

Q.

Main constituents of coal gas are-

1. ${\mathrm{H}}_2\mathrm{O},{\mathrm{C}}_2{\mathrm{H}}_6,{\mathrm{O}}_2$

2. ${\mathrm{CH}}_4,{\mathrm{CO}}_2,{\mathrm{O}}_2$

3. ${\mathrm{CH}}_4,{\mathrm{H}}_2,\mathrm{CO}$

4. ${\mathrm{C}}_2{\mathrm{H}}_6,{\mathrm{N}}_2,{\mathrm{O}}_2$

Q. What happens when a base reacts with a metal

Q.

Which of the following has the maximum percentage of carbon in it?

1. Pig iron

2. Cast iron

3. Hard steel

4. Wrought iron

Q.

What is the composition of Brass?

Q.

If the impurity in an ore is basic then the flux should be basic in nature.

1. True

2. False

Q.

A non-metal present in stainless steel is __.

Q. is obtained due to the smelting of iron in blast furnace.

1. Pig iron
2. Cast iron
3. Wrought iron