p-Block Elements – II — Chemistry STD 12 — Question
Tamilnadu BoardEnglish MediumSTD 12Chemistryp-Block Elements – II3 Marks
Question
How is ammonia prepared?
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Answer
$1.$ Ammonia is formed by the hydrolysis of urea.
$NH _2 CONH _2+ H _2 O \rightarrow 2 NH _3+ CO _2$
$2.$ Ammonia is prepared in the laboratory by heating an ammonium salt with a base.
$2 NH _4^{+}+ OH ^{-} \rightarrow 2 NH _3+ H _2 O$
$2 NH _4 Cl + CaO \rightarrow CaCl _2+2 NH _3+ H _2 O$
$3.$ It can also be prepared by heating a metal nitrides such as magnesium nitride with water.
$Mg _3 N _2+6 H _2 O \rightarrow 3 Mg ( OH )_2+2 NH _3$
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