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Question
Name the method used for preparation of the following salt from the list given below:
Zinc ion and Lead ion.
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Solution
Zinc ion and Lead ion.
(i) \[\ce{ZnSO4 + 2NH4OH -> Zn(OH)2 v + (NH4)2SO4}\]
Zn(OH)2 forms white gelatinous precipitates. In the presence of excess of ammonium hydroxide these precipitates get dissolved.
(ii) \[\ce{Pb(NO3)2 + 2NH4OH -> Pb(OH)2 v + 2NH4NO3}\]
Pb(OH)2 forms white precipitates. This precipitate is insoluble in the presence of excess of ammonium hydroxide.
Concept Insight : Ammonium hydroxide forms insoluble hydroxides when treated with certain metallic salt solution. The insoluble hydroxides thus formed get precipitated in the form of a precipitate and may be identified by their distinct colours.
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RELATED QUESTIONS
Choose the correct answer from the options given below:
A chloride which forms a precipitate that is soluble in excess of ammonium hydroxide is:
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2) Ferrous chloride
3) Ferric chloride
4) Copper chloride
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