Write the chemical reactions involved in the extraction of mercury from cinnabar ore.

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

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

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

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

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

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

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

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