The metal that forms nitride by reacting directly with N_{2} of air is :

  • Option 1)

    Rb

  • Option 2)

    Cs

  • Option 3)

    K

  • Option 4)

    Li

Answers (1)
A admin

 

Nature of Nitrates of alkali metals -

Decomposed upon heating to nitrites and evolve O{_{2}}

- wherein

2NaNO{_{3}\overset{\Delta }{\rightarrow}2NaNO{_{2}}+O{_{2}}

 

 

Nitride of Li and Mg -

Both for nitride Li{_{3}}N, Mg{_{3}}N{_{2}} by direct combination with nitrogen

- wherein

Other alkali metals combine at high temperature

Only Li react with N2 from all alkali metals 

Rxn\rightarrow 6Li+N_{2}\rightarrow 2Li_{3}N

 


Option 1)

Rb

Option 2)

Cs

Option 3)

K

Option 4)

Li

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