KVPY SA Exam 2013 Question Paper

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Question : 71 of 80

Marks: +1, -0

CHEMISTRY

The degree of dissociation of acetic acid (0.1

\mol \L^{-1}

) in water (

K_a

of acetic acid is

10^{-5}

) is

0.01
0.5
0.1
1.0

Solution:

C = 0.1 M,

\K_\a = 10^{-5}

\K_\a = α^2\C

10^{-5} =α^2 × 0.1

α^2= 10^{-4}

α = 10^{-2}

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