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Question

MetalM + N2 heat−−−→ Nitride H2O−−−→ NH3, Metal M is


A

Na

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B

K

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C

Li

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D

Rb

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Solution

The correct option is C

Li


Lattice energy of the compound formed between small cation and small anion is highest. Since, nitride ion is a small anion and the lattice energy of the compound formed with small lithium cation is high. Lithium nitride is the most stable nitride of all the alkali metal nitrides. Hydrolysis of lithium hydride liberates ammonia gas.

6Li + N2 2Li3N H2O−− LiOH + NH3(g)


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