Gibbs energy vs T plot for the formation of oxides is given below.

For the given diagram, the correct statement is -

Given below are two statements: one is labelled as Assertion $$\mathbf{A}$$ and the other is labelled as Reason $$\mathbf{R}$$

Assertion A : Physical properties of isotopes of hydrogen are different.

Reason R : Mass difference between isotopes of hydrogen is very large.

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

The major product 'P' formed in the given reaction is:

The correct order of metallic character is :