Q.

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
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