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Question

# Acetic acid undergoes 25% dissociation and 30% association simultaneously. What will be the value of vant Hoff factor 'i'?

A
0.65
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B
0.11
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C
1.01
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D
1.10
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Solution

## The correct option is D 1.10 Let total amount of CH3COOH be x . 25% dissociation, α=25100x=0.25x30% association, α=30100x=0.3x dissociation CH3COOH→CH3COO−+H+t=0x00t=tx−0.25x0.25x0.25xt=t0.75x0.25x0.25x association:- 2CH3COOH→CCH3(00H)2t=t0.75x−0.30x0.30x2xt=t0.45x0.15xInitial amount =xFinal amoun t=(0.25+0.25+0.13+0.45)x=1.10xi= initial amount Final amount =1⋅10xx=1.10

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