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Question
Distinguish between the following pair of compounds using the test given within bracket.
A lead salt and a zinc salt (using excess ammonium hydroxide)
Solution
A lead salt and a zinc salt (using excess \[\ce{NH4OH}\])
\[\ce{pb(NO3)2 + 2NH4OH -> \underset{Chalky white ppt}{pb(OH)2↓} + 3(NH4)2SO4}\]
Insoluble in excess of \[\ce{NH4OH}\]
\[\ce{ZnSO4 + 2NH4OH -> \underset{White gelatinous ppt}{Zn(OH)2↓} + (NH4)2SO4}\]
With the excess of \[\ce{NH4OH}\] ppt. dissolves
\[\ce{Zn(OH)2 + (NH4)2SO4 + 2NH4OH -> \underset{Tetra amine zinc sulphate}{[Zn(NH3)4]SO4} + 4H2O}\]
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