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Question

The metal that forms a nitride by reacting directly with atmospheric N2 is:

A
Li
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B
Rb
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C
K
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D
Cs
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Solution

The correct option is A Li
Li reacts with N2 to form Li3N because of the small size of Li.

6Li+N23Li2N

The lattice energy released from the formation of Li3N is high enough to make the overall reaction exothermic. For all the other alkali metals, the lattice energy is not high enough.

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