A mixture of Al(OH)₃ and Fe(OH)₃ can be separated easily by treating it with:

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NaOH

HNO₃

HCl

NH₄OH

answer is D.

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Detailed Solution

Fe(OH)₃ is insoluble in aqueous sodium hydroxide solution. Whereas Al(OH)₃ is soluble in excess of sodium hydroxide. Thus, to separate Fe(OH)₃ and Al(OH)₃, aqueous NaOH solution is added. Al(OH)₃ will dissolve in it whereas Fe(OH)₃ will remain insoluble. The two can then be separated by filtration.

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