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Question

For a reaction,

nAAn,

Find a relation between the degree of association, observed vapor density and theoretical vapor density when A trimerizes.

d= Observed vapour density,
D= Theoretical vapour density,
α= degree of association

A
2(dDd)
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B
32(dDd)
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C
43(dDd)
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D
2(Ddd)
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Solution

The correct option is D 32(dDd)
According to Ostwald's law of dilution,

where d= Observed vapour density
D= Theoretical vapour density
α= degree of association
n= number of molecules that undergo association.

For association of molecule,
α=dDd(11n)

Substitute n=3

α=dDd(113)

α=dDd(23)

α=32(dDd)

Hence, option (C) is the correct answer.


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