When \( 100 \mathrm{~mL} \) of \( 0.1 \mathrm{M} \mathrm{NaCN} \) solution is titrated with \( 0...

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When \( 100 \mathrm{~mL} \) of \( 0.1 \mathrm{M} \mathrm{NaCN} \) solution is titrated with \( 0.1 \mathrm{M} \mathrm{HCl} \) solution the variation of \( \mathrm{pH} \) of solution with volume of \( \mathrm{HCl} \) added will be :
(b)
(c)
(d)
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