The lubricating action of an oil is more if it possess:
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a
high vapour pressure
b
low vapour pressure
c
high surface tension
d
high density
answer is B.
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Detailed Solution
Substances of high vapour pressure (e.g., gasoline) evaporates more quickly than substances of low vapour pressure (e.g., motor oil).Low vapour pressure liquids doesnot evoparates,hence lubricating action is more