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JEE Main 202116 MarchMorning Shift
Exam
JEE Main
Year
2021
Date
16 March
Shift
Morning Shift
Subject
Chemistry
Chapter
Chemical Bonding and Molecular Structure

JEE Main 2021 · 16 March · Morning Shift · Chemistry · Chemical Bonding and Molecular Structure

Given below are two statements: one is labelled as Assertion A and...

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R :

Assertion A : The H−O−HH - O - H bond angle in water molecule is 104.5°104 . 5 °.

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

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R : Assertion A :

Options

  1. AA is false but R is true
  2. BBoth A and R are true, but R is not the correct explanation of A
  3. CA is true but R is false
  4. DBoth A and R are true, and R is the correct explanation of A

Correct answer

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

Step-by-step solution

H2O{H}_{2}O

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R : Assertion A :

θ=104.5°\theta = 104 . 5 °

The hybridisation of oxygen is water molecule is sp3{sp}^{3}.

So electron geometry of water molecule is tetrahedral, and the bond angle should be 109 ° {28}^{' '} but as we know that lone pair-lone pair repulsion of electrons is higher than the bond pair-bond pair repulsion because lone pair occupies more space around central atom than that of bond pair, The H−O−HH - O - H bond angle in water molecule is 104.5°104 . 5 °.

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