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Question

A colourless crystalline salt X is soluble in dilute HCl. On adding NaOH solution, it gives a white precipitate which is insoluble in excess of NaOH. X is :

A
Al2(SO4)3
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B
ZnSO4
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C
MgSO4
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D
SnCl2
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Solution

The correct option is D MgSO4
MgSO4 is soluble in HCl and gives MgCl2+H2SO4(aq)
MgSO4(s)+2HCl(aq)MgCl2+H2SO4(aq)
Mg2+(aq)+2Cl(aq)+Na+(aq)+OH(aq)Mg(OH)2(s)+Na+(aq)+Cl(aq)
Then, find the net ionic equation by cancelling out any species that appear on both sides of the equation.
Mg2+(aq)+2OH(aq)Mg(OH)2(s)
A colourless crystalline salt X is soluble in dilute HCl On adding NaOH solution, it gives a white precipitate (Mg(OH)2) which is insoluble in excess of NaOH. X is MgSO4
Hence option C is correct.

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