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The pH of mono-acidic base `12.6990`. The molarity of the base is

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The pH of mono-acidic base `12.6990`. The molarity of the base is
A. `0.02 "moles"//"litre"`
B. `0.05 "moles"//"litre"`
C. `0.05 "moles"//"litre"`
D. `0.2 "moles"//"litre"`
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Correct Answer - B
`P^(H) = 12.699`
`p^(OH) = 1.3010`
`[O^(-)H] = 10^(-1.3010)`
`= 10^(-2) xx 10^(0.699)`
`= 5 xx 10^(-2) M`
`= 0.05 M`
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