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JEE Main levelSingle correct optionDifficulty 2 of 3sb131

Magnesium is burnt in air and the white residue is dropped into warm water. The gas evolved that turns moist red litmus blue is:

A $NH X_{3}$
B $N X_{2}$
C $H X_{2}$
D $NO X_{2}$

Answer: A

Burning of Mg in air gives

MgO

along with

Mg X_{3} N X_{2}

. The nitride is hydrolysed:

Mg X_{3} N X_{2} + 6 H X_{2} O 3 Mg (OH) X_{2} + 2 NH X_{3}

, and ammonia is basic, turning red litmus blue.

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