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Question
Distinguish between the given pairs of compounds using the test given within brackets:
A lead salt and a zinc salt (using excess ammonium hydroxide)
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Solution
On addition of the excess of ammonium hydroxide to lead nitrate, a chalky white ppt. of Pb
(OH)2 is formed. On addition of the excess of ammonium hydroxide to zinc sulfate, a
white gelatinous ppt. of Zn(OH)2 is formed which is soluble.
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