A metal chloride original solution (i.e. O.S) on mixing with \( \ma...

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A metal chloride original solution (i.e. O.S) on mixing with \( \mathrm{K}_{2} \mathrm{CrO}_{4} \) solution gives a yellow precipitate soluble in
\( \mathrm{P} \) aqueous sodium hydroxide. The metal may be :

W
(a) mercury
(b) iron
(c) silver
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