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Q.

An aqueous solution contains both Al3 and Zn2+. To this solution NH4OH is added in excess :

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a

both will be precipitated

b

only Al(OH)3 will be precipitated

c

no precipitate will appear

d

only Zn(OH)2 will be precipitated

answer is A.

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Detailed Solution

Al(OH)3 is Insoluble in excess NH3.

In excess of NH4OH ppt of Zn(OH)2 will get dissolved.  The correct option is A.

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