Question

The bond angle (HOH) in water molecule is 104°31' instead of 90 degree why​

Answer 1

The bond angle (HOH) in water molecule is 104°31' instead of 90 degree

Explaination:

In water molecule, there are 2 lone pairs on oxygen atom, which results in repulsion between bonding and lone pairs and water has a bent shape with bond angle 104.5 degrees.

Answer 2

The bond angle (HOH) in water molecule is 104°31' instead of 90 degree because of the presence of lone pair-lone pair repulsion.

Explanation:

• Chemical formula of water is $H_{2}O$ and structure of this molecule is bent shape and not linear. This is because oxygen atom is a non-metal which contains two lone pairs.

• So, the two hydrogen atoms are bonded to one oxygen atom through hydrogen bonds. As it is known that bond pair-bond pair repulsion is less than bond pair-lone pair repulsion and lone pair-lone pair repulsion are much greater than rest of these two repulsion.

• Due to the presence of two lone pair of electrons on the oxygen atom there will occur high repulsion. As a result, the hydrogen atoms will bend down and slightly come closer to each other. As a result, the bond angle of water will be $104^{o}31'$.

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