JEE Main 2022 Physics question
Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R). 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. In the light of the above statements, choose the correct answer from the option given below.
Answer: (1)
Solution
For a water–oil interface the angle of contact is greater than 90° (obtuse), so water does
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