Extraction from Concentrated Ores

Q. Which of the following minerals is an ore of aluminium?

1. Bauxite
2. Cryolite
3. Fluorspar
4. Feldspar

Q. ______ is a process of heating the concentrated ore at the temperature below its melting point in the presence of air.

1. Electrolysis
2. Leaching
3. Calcination
4. Roasting

Q.

Give reason for the following:

No reaction takes place when a piece of copper is placed in ferrous sulphate solution.

Q.

Which of the following statements are true regarding smelting?

1. Ore is heated to make chemical changes.

2. It is a hydrometallurgical process.

3. Reduction of ore occurs in smelting.

4. Slag is not formed during the smelting process.

Q.

Identify whether the reaction is possible

ZnSO₄ + Cu → CuSO₄ + Zn

Q. Assertion (A): Aluminium acts as a reducing agent in thermite process.
Reason (R): Highly reactive metals such as Na, Ca, Al, etc., can be used as reducing agents to displace metals of lower reactivity from their compound​.

1. Both A and R are false
2. Both A and R are true, but R is not the correct explanation of A
3. A is true but R is false
4. Both A and R are true, and R is the correct explanation of A

Q. Haematite can be concentrated by magnetic separation.

1. False
2. True

Q.

Match the following iron ores with their formulae.

$\begin{array}{cc}\text{Name of ore}& \text{Formula}\\ \text{i) Magnetite}& a)F{e}_2{O}_3\\ \text{ii) Haematite}& b)Fe{S}_2\\ \text{iii) Spathic iron ore}& c)FeC{O}_3\\ \text{iv) Iron pyrite}& d)F{e}_3{O}_4\end{array}$

1. $i\to d,ii\to a,iii\to b,iv\to c$

2. $i\to c,ii\to a,iii\to b,iv\to d$

3. $i\to c,ii\to a,iii\to d,iv\to b$

4. $i\to d,ii\to a,iii\to c,iv\to b$

Q.

Choose the correct sequence for extraction of metal from its ore.

i) Concentration of ore
ii) Reduction of metallic oxides
iii) Conversion of the ore into its oxide
iv) Refining of impure metal

1. $i\to ii\to iii\to iv$
2. $iv\to i\to iii\to ii$
3. $i\to iii\to ii\to iv$
4. $i\to iii\to iv\to ii$