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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 :

(1) Li and Mg

(2) Na and Ca

(3) Na and Rb

(4) Cs and Ba
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Ans. (1) Li and Mg

Sol. Li and Mg do not form solid bicarbonate. But react with N2 to give nitrides.

$\require{mhchem}\ce{6Li +N2->[\ \Delta\ ]2Li3N}$

$\ce{3Mg +N2->[\ \Delta\ ]Mg3N2}.$

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