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When `H_(2)S` gas is passed through a hot acidic aqueous solution containing `Cr^(+3), Cd^(+2), Hg^(+2)` and `Co^(+2)`, a precipitate is formed which

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When `H_(2)S` gas is passed through a hot acidic aqueous solution containing `Cr^(+3), Cd^(+2), Hg^(+2)` and `Co^(+2)`, a precipitate is formed which does not consist of:
A. `Cr_(2)S_(3)`
B. `HgS`
C. `CoS`
D. `CdS`
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Correct Answer - A::C
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