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Introduction to d and f Block Elements

A suspension ...

Question

A suspension containing insoluble substances $H g S$ and $F e S$ is treated with $N H_{4} C l$ On filtering, the filtrate contained appreciable amounts of which one of the following?

A

mercury, iron

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B

only iron

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C

only mercury

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D

none of these

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Solution

The correct option is B only iron
Only iron will react with $N H_{4} C l / N H_{4} O H$ and gives brown ppt. of
$F e (O H)_{3}$ .

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