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Q.

Which of the following is precipitated as sulphide in acidic solutions

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a

Ni2+

b

Mn+2

c

Cu2+

d

Zn+2

answer is C.

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Detailed Solution

Cu+2 is a group II cation, which is precipitated by adding H2S(g) in presence of dil HCl as sulphide. HCl is added as a low concentration of S-2 ion is required to cause the precipitation. Other options belong to group IV cations, which are precipitated by adding H2S(g) in presence of NH4OH as for these cations relative higher concentration of S-2 ions are desired.

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