Q26.The gelatinous white precipitate which is excess of
amonium hydroxide is of
A. Calcium Hydroxide
B. Zinc Hydroxide
C. Magnesium Hydroxide
D. Lead Hydroxide
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(i) A bluish white precipitate appears which dissolves in excess of NH
OH and give an inky blue solution of tetra-amino copper sulphate.
(ii) A gelatinous white precipitate appears which dissolves in excess of NH
OH and give a clear transparent colourless solution of tetraamine zinc sulphate.
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Answer:
Sodium Hydroxide
Small amount In excess
Calcium nitrate White precipitate Insoluble
Zinc nitrate White precipitate Soluble
Lead nitrate White precipitate Soluble
Ammonium Hydroxide
Small amount In excess
Calcium nitrate No visible reaction No change
Zinc nitrate White precipitate Soluble
Lead nitrate White precipitate Insoluble
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