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  • Which of the following metal, on burning in moist air, does not give smell of ammonia?Option: 1 <img alt="\mathrm{Mg}" src="https://entrancecorner.on

Which of the following metal, on burning in moist air, does not give smell of ammonia?

Option: 1

\mathrm{Mg}


Option: 2

\mathrm{Ca}


Option: 3

\mathrm{K}


Option: 4

\mathrm{Li}


Answers (1)

best_answer

Potassium \mathrm{(K)}does not form nitride on burning in air.

Among the Group 1 elements, only Li form nitride whereas all Group 2 elements form nitride.

These nitrides in the presence of moist air form metal hydroxides and release ammonia.

\mathrm{Mg}+\mathrm{N}_{2} \rightarrow \mathrm{Mg}_{3} \mathrm{~N}+2 \mathrm{H}_{2} \mathrm{O}$ (moist) $\rightarrow \mathrm{Mg}(\mathrm{OH})_{2}+\mathrm{NH}_{3}
\mathrm{Ca}+\mathrm{N}_{2} \rightarrow \mathrm{Ca}_{3} \mathrm{~N}+2 \mathrm{H}_{2} \mathrm{O}$ (moist) $\rightarrow \mathrm{Ca}(\mathrm{OH})_{2}+\mathrm{NH}_{3}
\mathrm{Li}+\mathrm{N}_{2} \rightarrow \mathrm{Li}_{3} \mathrm{~N}+\mathrm{H}_{2} \mathrm{O}$ (moist) $\rightarrow \mathrm{LiOH}+\mathrm{NH}_{3}
\mathrm{\mathrm{K}+\mathrm{N}_{2} \rightarrow No \: reaction.}.
 

Posted by

rishi.raj

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