Verified Solution • 2025–26 Session moderate

QJEEM20Chc175: JEE Main 2020 Chemistry - Class 12 JEEM20Chc175 Solution: A metal (A) on heating in nitrogen gas gives compound B. B on…

A metal (A) on heating in nitrogen gas gives compound B. B on treatment with H2O gives a colourless gas which when passed through CuSO4 solution gives a dark blue-violet coloured solution. A and B respectively, are :

Multiple Choice Options

  • A Na and NaNO3
  • B Na and Na3N
  • C Mg and Mg3N2
  • D Mg and Mg(NO3)2

Step-by-Step Verified Solution

3Mg(A) + N2 ⟶Δ Mg3N2(B) ⟶6H2O
3Mg(OH)2 + 2NH3 (colourless gas)

CuSO + 4NH3 → [Cu(NH3)4]SO4 (deep blue solution)

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