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Question

What will be the degree of dissociation of 0.1M Mg(NO3)2 solution if van't Hoff factor is 2.74?

A
75%
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B
87%
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C
100%
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D
92%
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Solution

The correct option is A 87%
The van't Hoff factor is the ratio between the actual concentration of particles produced when the substance is dissolved and the concentration of a substance as calculated from its mass. For most non-electrolytes dissolved in water, the van't Hoff factor is essentially 1.

Mg(NO3)2Mg2++2NO3
α=i1n1
= 2.74131
= 1.742
= 0.87
Degree of Dissociation =0.87(100)=87%

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