Ammonia `(NH_(3))` is a colourless gas with a pungent odour. It can be prepared by

Options

A. hydrolysis of calcium cyanamide
B. hydrolysis of aluminium nitride
C. heating an ammonium salt with a base
D. All of these

Answer

4

Explanation

On a small scale ammonis is obtained from ammonium salts which decompose when heated with a storage base: Laboratory prepration
`2NH_(4)Cl+underset("slaked lime")(Ca(OH)_(2))overset(Delta)rarr2NH_(3)+2H_(2)O+CaCl_(2)`
`(NH_(4))_(2)SO_(4)+2NaOHrarr2NH_(3)+2H_(2)O+Na_(2)SO_(4)`
It is also onbtained when aluminimum nitride or calcium cyanamide is hydrolyzed:
`AlN+3H_(2)OrarrAl(OH)_(3)+NH_(3)`
`CaCN_(2)+3H_(2)O rarrCaCO_(3)+2NH_(3)`