Question

Given below two statements : One is labelled as Assertion A and the other is labelled as Reason .

Assertion A : The $\mathrm{H}-\mathrm{O}-\mathrm{H}$ bond angle in a water molecule is $104.5^{\circ }$

Reason R : The lone pair - lone pair repulsion of electrons is higher than the bond pair -bond pair repulsion.

In the light of the above statements , choose the correct Ans: from the options given below.

• A. A is false but R is true
• B. A is true but R is false
• C. Both A and R are true, and R is the correct explanation of A
• D. Both A and R are true, but R is not the correct explanation of A

Answer 1

The correct option is C

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

Answer (C)

Explanation for correct option:

The bond angle in ${\mathrm{H}}_2\mathrm{O}$ is $104.5^{\circ }$due to the presence of two lone pairs of electrons. This fact can be explained with the help of valence shell electron pair repulsion theory (VSEPR)

Hence option (C) is correct option.