A 0.01 M ammonia solution is 5 % ionized, the concentration of $O H^{-}$ ions is:

0.005M

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0.0001 M

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0.0005 M

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0.05 M

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Solution

The correct option is C 0.0005 M
The concentration is 0.01 M and the percentage of ionization is 5%.
The expression for the hydroxide ion concentration is,
$[O H^{-}] = C α = C \times \frac{p e r c e n t a g e}{100} = 0.01 \times \frac{5}{100} = 0.0005 M$ .

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