Two elements A and B have similar chemical properties. They don't form solid hydrogencarbonates, but react with nitrogen to form nitrides. A and B, respectively, are : (A) Li and Mg (B) Na and Ca (C)

Question

Two elements A and B have similar chemical properties. They don't form solid hydrogencarbonates, but react with nitrogen to form nitrides. A and B, respectively, are :

(A) Li and Mg
(B) Na and Ca
(C) Na and Rb
(D) Cs and Ba

Prashant Kotian · Accepted Answer

Correct answer: A. Li and Mg do not form solid bicarbonate. But react with N2 to give nitrides. 6 Li + N2   2 Li3N 3 Mg + N2   Mg3N2.

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