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The values of ionisation constants for s...

The values of ionisation constants for some pairs of acids and bases are given which of them is stronger ?
(a) Acetic acid `(K_(a) =1.8 xx 10^(5)),` boric acid `(K_(a) =5,8 xx 10^(-10))`
(b) Hydrofluoric acid `(K_(a)= 6.7 xx 10^(-4)), benzoic acid `(K_(a) =6.3 xx 10^(-5))`
(c) Ammonium hydroxide `(K_(b) =1.8 xx 10^(-5))` Magensium hydroxide `(K_(b) =8.1 xx 10^(-3))`

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The correct Answer is:
(a) Acetic acid (b) Hydrofluoric acid (C) Magnesium hydroxide
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