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The vapour pressur of 0.01molal solution...

The vapour pressur of `0.01molal` solution of weak base `BOH` in water at `20^(@)C` is `17.536mm`. Calculate `K_(b)` for base. Aqueous tension at `20^(@)C` is `17.540mm`. Assume molatilly and molarity same.

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The correct Answer is:
`9.74xx10^(-4);`
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