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

M g

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C a

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K

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L i

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Solution

The correct option is D $K$
In group I only $L i$ form nitride and all II group metals form nitride.
$M g + N_{2} \to M g_{3} N_{2} H_{2} O (moist) - ------ \to M g (O H)_{2} + N H_{3}$
$C a + N_{2} \to C a_{3} N_{2} H_{2} O (moist) - ------ \to C a (O H)_{2} + N H_{3}$
$L i + N_{2} \to L i_{3} N H_{2} O (moist) - ------ \to L i O H + N H_{3}$
$K + N_{2} \to$ no reaction.

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