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The addition ofNH4CNS to a neutral solution of cobalt(II) salt produces

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red precipitates

green precipitates

yellow procipitates

blue precipitates

answer is C.

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Detailed Solution

The addition of $N H_{4} C N S$ to a neutral solution of cobalt(II) salt produces blue precipitates.

The production of a complex ion, tetraisothiocyanatocobaltate(II) ion, when a concentrated solution of ammonium thiocyanate is added to solutions containing cobalt(II) ion gives rise to a blue color.

Acetone makes this complex ion more stable, and adding roughly the same amount of acetone will intensify the color blue precipitates.

Hence, option C is correct.

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