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Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R : Assertion A : The H–O–H bond angle in water molecule is 104.5°. Reason R : The lone pair – lone pair repulsion of electrons is higher than the bond pair – bond pair repulsion. (1) A is false but R is true (2) Both A and R are true, but R is not the correct explanation of A (3) A is true but R is false (4) Both A and R are true, and R is the correct explanation of A

1. (1) A is false but R is true
2. (2) Both A and R are true, but R is not the correct explanation of A
3. (3) A is true but R is false
4. (4) Both A and R are true, and R is the correct explanation of A

Correct answer: (2) Both A and R are true, but R is not the correct explanation of A

Solution

The bond angle in water is indeed 104.5°, making Assertion A true. However, while the reasoning about lone pair repulsion is valid, it does not directly explain the specific bond angle in water, thus making Reason R true but not a correct explanation for Assertion A.

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