Alkali metal from the following with least melting point is :

Given below are two statements :

Statement I : In the metallurgy process, sulphide ore is converted to oxide before reduction.

Statement II : Oxide ores in general are easier to reduce.

In the light of the above statements, choose the most appropriate answer from the options given below:

Which one of the following pairs is an example of polar molecular solids?

The major product formed in the following reaction is

Choose the correct answer from the options given below :