In the extraction of copper from its sulphide ore, the metal is formed by the reduction of ${\mathrm{Cu}}_2\mathrm{S}$ with :
1. $\mathrm{FeS}$   
2. $\mathrm{CO}$
3. $C{u}_{2}O$   
4. ${\mathrm{SO}}_2$

Brine is electrolysed by using inert electrodes. The reaction at the anode is:

1. Cl^-(aq) → \(\frac{1}{2}\)Cl₂(g) + e^-;  \(E_{cell}^{o}\) = 1.36 V

2. 2H₂O(l) → O₂(g) + 4H⁺ +  4 e^-;  \(E_{cell}^{o}\) = 1.23 V

3. Na⁺(aq) + e^- → Na(s); \(E_{cell}^{o}\) = 2.71 V

4. H⁺(aq) + e^- → \(\frac{1}{2}\)H₂(g); \(E_{cell}^{o}\) = 0.00 V

In the metallurgy of aluminium:

Extraction of gold and silver involves leaching the metal with $C{N}^{-}$ ion. The metal is recovered by ......

The temperature at which carbon reduce FeO to Fe and produce CO is:

1. Lower than  400 ^oC

2. 400 ^oC

3. Higher than 600 ^oC

4. Higher than 400 ^oC

The correct statement among the following regarding the reaction of FeO below point A in the above diagram is:

 
1. Reduced by carbon monoxide only.

2. Reduced by both carbon monoxide and carbon.

3. Reduced by carbon only.

4. Not  reduced by both carbon and carbon monoxide.

The correct statement for the reduction of FeO at the temperature corresponding to point D is: 
 

  

Consider the following figure

At the temperature corresponding to which of the points FeO will be reduced to Fe by coupling the reaction 2FeO →2Fe + O₂ with all of the following reactions?

(i) C + O₂ →CO₂
(ii) 2C + O₂ → 2CO
(ii) 2CO + O₂ → 2CO₂

a.  Point A             

b.  Point B

c.  Point D           

d.  Point E

Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (b, d)

Which of the following statement is correct?  

1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)