Q.

Given below are two statements 

Assertion (A) : Clothes containing oil or grease stains cannot be cleaned by water wash. 

Reason (R) : Because the angle of contact between the oil/grease and water is obtuse. 

Choose the correct answer from the option given below

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a

Both A and R are true but R is not the correct explanantion of A

b

Both A and R are true and R is the correct explanation of A

c

A is false but R is true

d

A is true but R is false

answer is A.

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Detailed Solution

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Due to obtuse angle of contact the water doesn’t wet the oiled surface properly and cannot wash it also.
 Assertion is correct and Reason given is a correct explanation.

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Given below are two statements Assertion (A) : Clothes containing oil or grease stains cannot be cleaned by water wash. Reason (R) : Because the angle of contact between the oil/grease and water is obtuse. Choose the correct answer from the option given below