Questions  

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) ?

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By Expert Faculty of Sri Chaitanya
a
FeSO4⋅7H2O
b
Na2SO4⋅10H2O
c
MgSO4⋅7H2O
d
CaSO4⋅2H2O
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detailed solution

Correct option is C

MgSO4​+(NH4​)3​PO4​ → Mg3​(PO4)​2​(white ppt) +(NH4​)2​SO4​ And in cobalt nitrate cavity test: 2Co(NO3​)2​ → 2CoO +4NO2​ +O2​CoO + MgO → CoO. MgO (pink)

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