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The metal that forms nitride by reacting directly

Question:

The metal that forms nitride by reacting directly with $\mathrm{N}_{2}$ of air, is :

  1. $\mathrm{K}$

  2. $\mathrm{Cs}$

  3. $\mathrm{Li}$

  4. $\mathrm{Rb}$


Correct Option: , 3

Solution:

Only Li react directly with $\mathrm{N}_{2}$ out of alkali metals

$6 \mathrm{Li}+\mathrm{N}_{2} \rightarrow 2 \mathrm{Li}_{3} \mathrm{~N}$

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