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Ionisation constant of a weak base MOH, ...

Ionisation constant of a weak base MOH, is given by the expression
`K_(b)=([M^(+)][OH^(-)])/([MOH])`
Values of ionisation constant of some weak bases at a particular temperature are given below :
`underset(K_(b))(Base)" "underset(5.4xx10^(-4))("Dimethylamine")" "underset(1.3xx10)(H_(2)O(l))" "underset(1.77xx10^(-9))("Pyridine")" "underset(1.77xx10^(-5))("Ammonia")`
Arrange the bases in decreasing order of the extent of their ionisation at equilibrium. Which of the above base is the strongest?

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