Q.

The KSP  of  MgOH2 is 1 × 10-12.  0.01 M  MgOH2  will precipitate at the limiting pH

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a

3

b

9

c

5

d

8

answer is B.

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Detailed Solution

Mg2+  OH-2 = 10-12 0.01 × OH-2 = 10-12 OH- = 10-5 M ∴   H+ = 10-9 M and pH = -log 10-9 = 9
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