Which of the following salt will not produce black ppt. on passing H2S through their aqueous salt solution in desired medium?
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Answer : CuSO 4 +H 2 S⟶ blackppt CuS +H 2 SO 4 CuS+2HNO
3
⟶
bluesolution
Cu(NO
3
)
2
+H
2
S
Cu(NO
3
)
2
+4NH
3
⟶
deepbluesolution
Cu(NH
3
)
4
]
2+
+2NO
3
−
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