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Upon treatment with ammoniacal H 2 S , the metal ion that precipitates as a sulphide is

Options

  1. AFe III
  2. BAl III
  3. CMg II
  4. DZn II

Correct answer

D. Zn II

Step-by-step solution

Among Fe 3+ , Al 3+ , Mg 2+ and Zn 2+ , only Zn 2+ is precipitated with ammoniacal H 2 S as ZnS. The group III metal ions, in presence of NH 4 OH when H 2 S is bubbled through filtrate Ni 2 + , Co 2 + and Zn 2 + are precipitated as sulphides.

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