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[" 60"K(a)" for HCN is "5times10^(-10)" ...

[" 60"K_(a)" for HCN is "5times10^(-10)" at "25^(@)C" .For maintaining "],[" a constant pH "=9," the volume of "5MKCN],[" solution required to be added to "10mL" of "2M],[" HCN solution is "],[[" (a) "4mL," (b) "2.5mL],[" (c) "2mL," (d) "6.4mL]]

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