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JEE Main levelSingle correct optionDifficulty 2 of 3ie072

A $0.1 M$ solution of a weak acid has degree of ionisation $0.01$ . If it is diluted to $0.025 M$ (assume $α ≪ 1$ ), the new degree of ionisation is

A $0.04$
B $0.02$
C $0.005$
D $0.0025$

Answer: B

Ostwald's law for small

α

:

α \propto 1/ c

. The concentration falls by a factor of 4, so

α

rises by

4 = 2

, from

0.01

to

0.02

.

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