1.

The solubility products of Al(OH)_3 and Zn(OH)_2 are 8.5xx 10^(-23) and 1.8 xx 10^(-14) respectively. If NH_4 OH is added to a solution containing Al^(3+) and Zn^(2+) ions, then substance precipitated first is

Answer»

Al`(OH)_2`
`Zn(OH)_2`
both simultaneously
NONE of these

Solution :Since ` K_(sp)`of AI `(OH)_3` is lessthan ` K_(sp)`of ` Zn (OH)_2`
thussolubilityof `AI (OH)_3`is lessthan ` Zn(OH)_2`. HENCE`Al (OH)_3` willprecipitatefirst .


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