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Q.

Which of the following cations cannot be separated by passing H2S  through their solutions to which   NH4Cl and NH4OH  have been added?

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a

Ca2+  and  Ni2+

b

Mg2+  and  Mn2+

c

Ni2+  and  Mn2+

d

Co2+  and  Zn2+

answer is C, D.

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Detailed Solution

 Ni2+ and  Mn2+, Co2+  and Zn2+ belongs to IV group.

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