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Q.
One mole of magnesium nitride on the reaction with excess of water gives
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Solution:
One mole of magnesium nitride on the reaction with an excess of water gives two moles of ammonia and 3 moles of magnesium hydroxide.
$M g _{3} N _{2}+ 6 H _{2} O \longrightarrow 3 M g ( O H )_{2}+ 2 N H _{3}$