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Q.

Which of the following is the correct solubility of NiOH2 in 0.10 M NaOH? Ksp of NiOH2 is 2.0×10-15.

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a

1×10-13

b

2×10-13

c

3×10-13

d

5×10-12

answer is B.

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Detailed Solution

NiOH2⇌ Ni+2S+2OH-2SNaOH→ Na+0.1+OH-0.1Ksp=Ni2+OH-2S×2S+0.12=2×10-15         S×0.12=2×10-15                      S=2×10-3 M
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