HCN + NaOH --------------> NaCN + H2O
millimoles of HCN = 50 x 0.30 = 15
millimoles NaOH added = 50 x 0.30 = 15.0
means all HCN convert to NaCN.
NaCN is salt of weak acid so basic in nature
pH > 7
answer = option C = greater than 7
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