The zinc oxide formed after the process of calcination or roasting undergoes reduction to obtain or extract zinc.

$2\underset{\mathrm{s}}{\mathrm{PbO}} + \underset{\mathrm{s}}{\mathrm{C}} \to 2\underset{\mathrm{s}}{\mathrm{Pb}} + 2\underset{\mathrm{g}}{{\mathrm{CO}}_2}$

Which of the following statements are correct for the above chemical reaction?

(i) Lead is reduced.

(ii) Carbon di oxide is oxidised.

(iii) Carbon is oxidised.

(iv) Lead oxide is reduced

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

($\mathrm{Al}=27\mathrm{u}, \mathrm{Fe}=56\mathrm{u}, \mathrm{O}=16\mathrm{u}$ are the atomic masses)

How much of Iron, we can get if 54 kg of Aluminium is used?

$$\begin{gathered} \mathrm{X}+\mathrm{Y} \to \mathrm{Z}+{\mathrm{SO}}_2 \\ \mathrm{X}+\mathrm{Z}\to \mathrm{Cu}+{\mathrm{SO}}_2 \end{gathered}$$

Identify X, Y and Z:

Choose the correct statements about the given chemical reaction: 

$3{\mathrm{MnO}}_2\left(\mathrm{S}\right) + 4\mathrm{Al}\left(\mathrm{S}\right) \to 3\mathrm{Mn}\left(\mathrm{l}\right) + 2{\mathrm{Al}}_2{\mathrm{O}}_3+ \mathrm{Heat}.$

a) Reaction is exothermic.

b) Al is acting as a reducing agent.

c)${\mathrm{MnO}}_2$  is getting reduced.

d) Al is more reactive than Mn

Write short note on electrolytic refining of metals.

Write the steps involved in the extraction of pure metals in the middle of the activity series from their carbonate ores.

In the given figure, the purification of copper in electric decomposition is shown. Label against $\left[1\right],\left[2\right],\left[3\right],\left[4\right]$ and $\left[5\right]$.