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Covalent Bonding in H2, N2 and O2

In a water mo...

Question

In a water molecule, there is/are ______ valence electron(s) of Oxygen which do not take part in the covalent bond formation.

A

four

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B

two

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C

one

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D

three

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Solution

The correct option is B two
Oxygen has six electrons in its valence shell. It shares two electrons with two hydrogen atoms to form $H_{2} O$ molecule. Hence, there are four electron which do not take part in covalent bond formation with hydrogen.
The electron dot structure of water molecule is given below:

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