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Colours in Coordination Compounds

A hydrated co...

Question

A hydrated colorless solid (A) is water soluble and finds use in medicine as a purgative. When a solution of (A) is treated with ammonium phosphate, a white precipitate is formed. (A) gives a pink mass is cobalt nitrate test. What is (A) ?

A

F e S O_{4} \cdot H_{2} O

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B

N a_{2} S O_{4} \cdot 10 H_{2}

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C

M g S O_{4} \cdot 7 H_{2} O

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D

C a S O_{4} \cdot 2 H_{2} O

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Solution

The correct option is B $M g S O_{4} \cdot 7 H_{2} O$
Salts of zinc, tin, aluminum and magnesium which give white residue in the charcoal cavity test, on hating with cobalt nitrate form coloured double oxides.
$2 C o (N O_{3})_{2} \to 2 C o O + 4 N O_{2} + O_{2}$
$C o O + M g O \to C o O . M g O (P i n k)$
Hence the salt is $M g S O_{4} .7 H_{2} O$

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Q. A hydrated colorless solid (A) is water soluble and finds use in medicine as a purgative. When a solution of (A) is treated with ammonium phosphate, a white precipitate is formed. (A) gives a pink mass in cobalt nitrate cavity test. What is (A) ?

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Q. A metal nitrate on reaction with excess sodium hydroxide solution gives a white precipitate but it rapidly turns brown on adding bromine water. Aqueous solution of metal nitrate produces a pink precipitate with disodium hydrogen phosphate solution in the presence of ammonia. The cation is:

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