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Match the effect of addition of 1M NaOH ...

Match the effect of addition of `1M NaOH` to `50 mL` of `1M H_(2)C_(2)OH` (diprotic acid) in column I with column II (Given : `K_(a_(1)) = 10^(-4), K_(a_(2)) = 10^(-9))`:

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a-p,q ; b-q,r ; c-p,q,s ; d-r,s
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