Elements A and B do not form solid bicarbonate but react with $N_{2}$ to give nitrides. Which of the following can be A and B?

L i, M g

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R b, N a

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C a, C s

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C a, N a

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Solution

The correct option is A $L i, M g$
$L i$ and $M g$ do not form solid bicarbonate but react with $N_{2}$ to give nitrides.
$6 L i + N_{2} Δ - ---- \to 2 L i_{3} N$

$3 M g + N_{2} Δ - ---- \to M g_{3} N_{2}$
Other elements given here form solid bicarbonates.
Hence (a) is the correct option.

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