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Polar Nature

Why are some ...

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Why are some covalent molecules polar?
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Solution

The correct option is A 0
Covalent compounds are formed by the sharing of electrons due to little difference in their electronegativity. In the formation of polar covalent compounds, due to slight difference in their electronegativity there arises partial positive and negative charges leading to the formation of polar molecules.

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Q. Assertion : The atoms in a covalent molecule share electrons but some covalent compounds are polar compounds
Reason : In polar covalent molecules, the shared electrons will be close to one of the atoms.

Q. Assertion :The atoms in a covalent molecule are said to share electrons, yet some covalent molecules are polar. Reason: In polar covalent molecules, the shared electrons spend more time on the average near one of the atoms due to high EN.

B F_{3}

N F_{3}

both molecules are covalent, but

B F_{3}

is non-polar and

N F_{3}

is polar. Its reason is:

Q. Can a non polar molecule have polar covalent bonds?

Q. All homoatomic molecules possess non polar covalent bonds.

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