P-Block Elements Ques 281

Question: V-A group precipitate was dissolved in $ HNO_3 $ and treated with excess of $ NH_4OH $ . It gives a white ppt. because of

Options:

A) $ Cu{{(OH)}_2} $

B) $ Cd{{(OH)}_2} $

C) $ Bi{{(OH)}_3} $

D) $ Hg{{(OH)}_2} $

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Answer:

Correct Answer: C

Solution:

When the black ppt. of $ Bi_2S_3 $ is dissolved in 50% $ HNO_3 $ and a solution of $ NH_4OH $ is added. A white ppt. of $ Bi{{(OH)}_3} $ is obtained.



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