Q.

A hydrated colorless solid (A) is water soluble and finds use in medicine as a laxative. 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) ?

Moderate

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FeSO4⋅7H2O

Na2SO4⋅10H2O

MgSO4⋅7H2O

CaSO4⋅2H2O

answer is C.

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Detailed Solution

MgSO4+(NH4)3PO4 → Mg3(PO4)2(white ppt) +(NH4)2SO4 And in cobalt nitrate cavity test: 2Co(NO3)2 → 2CoO +4NO2 +O2CoO + MgO → CoO. MgO (pink)

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