Q.

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:

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a

Li and Mg

b

Cs and Ba

c

Na and Ca

d

Na and Rb

answer is A.

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Detailed Solution

IA from solid bicatrbonates and don’t readily react with nitrogen to form nitrides, except LiIIA form nitrides with N2 but don’t form solid bicarbonates ∴Ans is Li & Mg
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