Analytical Chemistry Question 245
Question: Three separate samples of a solution of a single salt gave these test results : One formed a white precipitate with excess ammonia solution, one formed a white precipitate with dil. $ NaCl $ solution and one formed a black precipitate with $ H_2S $ . The salt could be
[Pb. PMT 1998]
Options:
A) $ AgNO_3 $
B) $ Pb{{( NO_3 )}_2} $
C) $ Hg{{( NO_3 )}_2} $
D) $ MnSO_4 $
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Answer:
Correct Answer: A
Solution:
$ AgNO_3 $ react with all conditions and gives corresponding result. $ AgNO_3+2NH_3\to \underset{\text{White ppt}}{\mathop{[Ag{{(NH_3)}_2}]NO_2}}+H_2O $
$ AgNO_3+NaCl\to \underset{\text{White ppt}}{\mathop{AgCl}}+NaNO_3 $
$ 2AgNO_3+H_2S\to \underset{\text{Black ppt}}{\mathop{Ag_2S}}+2HNO_3 $ .
BETA
