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500mL of 0.2M HCN solution is diluted to...

500mL of 0.2M HCN solution is diluted to 1 litre.Which of the following statement(s) is/are correct `(K_(a)` of HCN =`2times10^(-10))`
(A) pH of solution increases.
(B) pH of solution decreases.
(C) Increase in degree of dissociation of HCN increases `H^(+)` ion concentration.
(D) Decrease in concentration of solution compensates increase in degree of dissociation to decrease `H^(+)`

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