What is the common method for extraction of metals from their oxides?

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

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

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

Find the odd man out: 

Tinning, Anodisation, Alloying, Froth floatation. 

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

Identify X, Y and Z:

Write short note on electrolytic refining of metals.

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

($\mathrm{Al}=27\mathrm{u}, \mathrm{Fe}=56\mathrm{u}, \mathrm{O}=16\mathrm{u}$ 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.