Analytical Chemistry Question 139
Question: An aqueous solution of a substance gives a white precipitate on treatment with dilute hydrochloric acid, which dissolves on heating. When hydrogen sulfide is passed through the hot acidic solution, black precipitate is obtained. The substance is a
Options:
A) $ Hg_2^{2+} $ salt
B) $ C{u^{2+}} $ salt
C) $ A{g^{2+}} $ salt
D) $ P{b^{2+}} $ salt
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Answer:
Correct Answer: D
Solution:
[d] $ PbCl_2 $ is soluble in hot water, and insoluble in cold water. $ P{b^{2+}}+2HCl\to \underset{\begin{smallmatrix} whiteppt.soluble \\ onheating \end{smallmatrix}}{\mathop{PbCl_2}}\downarrow \xrightarrow{H_2S}\underset{Blackppt.}{\mathop{PbS}} $
BETA
