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