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Q.

The pH of 0.0008 M Mg(OH)2 is 

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a

2.8       

b

11.2     

c

8.2                   

d

9.6

answer is B.

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Detailed Solution

Mg(OH)2Mg2++2OH-

1                     1             2

8×10-4         8×10-4    2×8×10-4

[H+]=1×10-14[OH-]=1×10-142×8×10-4

pH=-log(116×10-10)   10-log116=10+1.2=11.2

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