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Chloroform and acetone form a hydrogen bond, so the vapour pressure:
ADoubles up
BDecreases
CIncreases
DStays same
Answer & Solution
Correct answer: B. Decreases
1. The new hydrogen bond holds the two kinds of molecule together.
2. Their escaping tendency is cut down as a result.
3. So the vapour pressure decreases, a negative deviation.
_Source: NCERT Class 12 Chemistry Part I, Chapter 2, Solutions._
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