Question

A &B are metals both gives oxides but only B gives nitride then A&B are respectively

Answer 1

Reaction with air;

Mg+air→MgO+Mg3N2

and,

sodium forms peroxide and monoxide as product with air

Na+air→Na2O2 +Na2O.

Therefore, A is Na (sodium) and B is Mg (Magnesium).

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Answer 2

Explanation:

a is sodium b is magnesium