Q45 / 150 · MHT CET 2025 (21 Apr Shift 1) · Chemistry

Identify the product when magnesium burns in air.

  • A
    MgO only
  • B
    $\mathrm{Mg}_3 \mathrm{~N}_2$ only
  • C
    $\mathrm{Mg}_2 \mathrm{NO}_3$
  • Correct answer
    D
    MgO and $\mathrm{Mg}_3 \mathrm{~N}_2$

Solution

When magnesium burns in air, it undergoes reactions with both oxygen and nitrogen. The primary reactions are:

With oxygen: $2\mathrm{Mg} + \mathrm{O}_2 \rightarrow 2\mathrm{MgO}$

With nitrogen: $3\mathrm{Mg} + \mathrm{N}_2 \rightarrow \mathrm{Mg}_3\mathrm{N}_2$

The products formed are magnesium oxide and magnesium nitride.

Answer: D

Hence, the correct answer is option: 'D'.

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