Metals donot occur in nature as nitrates. Why?

3

(a)

Thermite process is quite useful for repairing broken parts of machines. Explain.

3

(a)

The extraction of gold by leaching with NaCN involves both oxidation and reduction. Justify giving equation.

3

(a)

In the metallurgy of copper partial roasting of sulphide ore is done. Why?

3

(a)

Why is the reduction of a metal oxide easier if the metal formed is in liquid state at the temperature of reduction?

3

(a)