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Question

If NH4OH in presence of NH4Cl is added to a solution containing Al2(SO4)3 and MgSO4, which of the following will precipitate?

A
Al(OH)3 only
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B
Mg(OH)2 only
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C
Al(OH)3 and Mg(OH)2
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D
None of these
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Solution

The correct option is A Al(OH)3 only
The sparing solute hydroxides derived from Fe3,Cr3 and AI3+ ions are precipitated by the addition of ammonia hydroxide, (NH4OH) solute in the presence of excess ammonium chloride, NH4CI and NH4OH helps in maintaining the pH,

Hydroxide K at 25C
AI(OH)3 1.4×1034

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