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Chemical Properties of Boron Family

A white powde...

Question

A white powder solid A forms a light green solution with water, which on treatment with potassium hexacyanoferrate(III) gives a blue precipitate. On being strongly heated, A leaves a
brown residue and forms a mixture of two gaseous oxides, which turns a dichromate solution
green and forms a white precipitate with a $B a C l_{2}$ solution containing concentrated HCl. A is:

A

C u S O_{4}

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B

F e_{2} (S O_{4})_{3}

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C

F e S O_{4}

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D

C r_{2} (S O_{4})_{3}

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Solution

The correct option is D $F e S O_{4}$
A: $F e S O_{4} \to F e_{2} O_{3} + S O_{2} + S O_{3}$ and with potassium hexacyanoferrate(III) it gives blue precipitate of ferro hexacyanoferrate(III).

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