A) \[1\times {{10}^{-8}}\]
B) \[8\times {{10}^{-8}}\]
C) \[1.1\times {{10}^{-8}}\]
D) \[0.18\times {{10}^{-8}}\]
Correct Answer: A
Solution :
\[Cr{{(OH)}_{3}}\ \to \ \underset{x}{\mathop{C{{r}^{+3}}}}\,+\underset{3x}{\mathop{3O{{H}^{-}}}}\,\] \[{{K}_{sp}}=x.{{(3x)}^{3}}=27{{x}^{4}}\] \[x=\sqrt[4]{\frac{{{K}_{sp}}}{27}}\] ; \[x=\sqrt[4]{\frac{2.7\times {{10}^{-31}}}{27}}\] \[x=1\times {{10}^{-8}}\]mole/litre.You need to login to perform this action.
You will be redirected in
3 sec