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:

N a a n d C a

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C s a n d B a

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N a a n d R b

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L i a n d M g

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Solution

The correct option is D $L i a n d M g$
$L i H C O_{3}$ and $M g (H C O_{3})_{2}$ does not exist in solid form but both forms nitrides with nitrogen gas.

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N_{2}

We have 4 elements Na, H, Cs and Rb which have similar electronic configuration. In periodic table they lie in?

The correct order of reactivity of alkalimetals towards $H_{2}$ is

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L i^{+}

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