Question

Metal M + air →(∆)>A→ (H20)>B → White fumes,
Metal M can be
(1) Li, Mg or Na, (2) Na, K or Mg
(3) Li, Mg or Al, (4) Li, Na or K​

Answer 1

Answer:

Reaction is:

Mg+airΔMg3N2H2OMg(OH)2+NH3HClNH4Cl 

In the same way, aluminium and Lithium reacts to form nitrides

Sodium, Potassium do not react with nitrogen to form nitrides.