Which of the following shows the highest percentage dissociation?

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$1.0 MHCN (K_{diss}^{\circ} = 4.0 \times 10^{- 10})$

$0.1 MHCN$

$1.0 M {HNO}_{2} (K_{diss}^{o} = 4.5 \times 10^{- 4})$

$0.1 M {HNO}_{2}$

answer is D.

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Detailed Solution

Ostwald dilution law; more dilute the solution, more the dissociation.

The degree of ionisation is directly equal to the square root of the volume of the solution containing one mole of the electrolyte or to the molar concentration of the electrolyte, according to the formulation of the Ostwald's Dilution Law for a weak electrolyte.

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