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  • The aqueous solution of salt with MgSO4 solution gives no precipitation in cold, but on heating, it gives white precipitation. The salt contains the acid radical:<div class='qna

The aqueous solution of salt with MgSO4 solution gives no precipitation in cold, but on heating, it gives white precipitation. The salt contains the acid radical:

Option: 1

C2O42-


Option: 2

SO42-


Option: 3

HCO3-


Option: 4

CO32-


Answers (1)

best_answer

As we have learnt,

Bicarbonates do not give precipitation in cold with MgSO4 but on heating, they form a white precipitate. The reactions occur as follows:

\mathrm{2HCO_{3}^{-}\: +\: Mg^{2+}\: \rightarrow \: Mg(HCO_{3})_{2}\: \overset{Heat}{\longrightarrow}\: MgCO_{3}\: +\: H_{2}O\: +\: CO_{2}}
                                                soluble                    white ppt.

Therefore, Option(3) is correct.

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