JEE Main · 2019 · 09 Apr 2019 · Shift 1 · s-Block Elements

Magnesium powder burns in air to give:

Answer: (B)

Solution

Burning magnesium is hot enough to seize both gases in the air. Oxygen gives magnesium oxide,

2 Mg + O X_{2} 2 MgO

, and nitrogen gives the nitride,

3 Mg + N X_{2} Mg X_{3} N X_{2}

. So the ash is a mixture of

MgO

and

Mg X_{3} N X_{2}

JEE Main · 2019 · 09 Apr 2019 · Shift 1 · Single correct option