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  • Which among the following gas evolves when a piece of magnesium ribbon is heated in an atmosphere of nitrogen and then cooled with water.Option: 1 Am

Which among the following gas evolves when a piece of magnesium ribbon is heated in an atmosphere of nitrogen and then cooled with water.

Option: 1

Ammonia


Option: 2

Hydrogen


Option: 3

Nitrogen


Option: 4

Oxygen


Answers (1)

best_answer

On heating in atmosphere,\mathrm{Mg} reacts with atmospheric \mathrm{N}_{2} to form nitrides.

3 \mathrm{Mg}+\mathrm{N}_{2} \rightarrow \mathrm{Mg}_{3} \mathrm{N}_{2}

These crystalline solids on reacting with water liberates \mathrm{NH}_{3} and form metal hydroxide.

\mathrm{Mg}_{3} \mathrm{~N}_{2}+6 \mathrm{H}_{2} \mathrm{O} \rightarrow 3 \mathrm{Mg}(\mathrm{OH})_{2}+2 \mathrm{NH}_{3}

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Pankaj

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