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Q.

Solubility product of Mg(OH)2, Cd(OH)2, Al(OH)3 and Zn(OH)2 are 4×1011,8×106,8.5×1023and 1.8×1014 respectively. The cation, that will precipitate first as hydroxide, on adding limited quantity of NH4OH in a solution containing equimolar amount of metal cation, is :

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a

Al3+

b

Cd2+

c

Zn2+

d

Mg2+

answer is A.

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Detailed Solution

OHMg(OH)2=4×1011xOHCdOH2=8×106xOHAr(OH)3=8.5×1023x3OHZnOH2=1.8×1014x

The value of the solubility product for the Al(OH)3 is 8.5×1023.  Its cation will precipitate first as hydroxide, on adding limited quantity of NH4OH in a solution containing equimolar amount of metal cation as its solubility product is quite low.

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