Give reasons for the following:

Non-metals in general do not displace hydrogen from dilute acids.

Describe ionic compounds on the basis of the following property:

Solubility of compounds in water.

Describe ionic compounds on the basis of the following property:

Electrical conductivity.

A metal X is so soft that it can be easily cut with a knife. Its oxide, soluble in water, forms compound which turns red litmus solution blue. Identify X.

Give your answer with chemical equation.

Given below is the step for the extraction of copper from its ore. Write the chemical equation of the reactions involved in this case.

Reduction of copper$\left(\mathrm{I}\right)$ oxide from copper$\left(\mathrm{I}\right)$ sulphide

Given below is one of  the steps for the extraction of copper from its ore. Write the chemical equation of the reactions involved in this case. 

Electrolytic refining