Qualitative Analysis - Result Question 16

16. An aqueous solution of a substance gives a white precipitate on treatment with dilute hydrochloric acid, which dissolves on heating. When hydrogen sulphide is passed through the hot acidic solution, a black precipitate is obtained. The substance is a

(2000,1 M)

(a) $Hg _2^{2+}$ salt

(b) $Cr^{2+}$ salt

(c) $Ag^{+}$salt

(d) $Pb^{2+}$ salt

Show Answer

Answer:

Correct Answer: 16. (d)

Solution:

$PbCl _2$ is soluble in hot water and $PbS$ (black) is formed on passing $H _2 S(g)$ through acidic solution.

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