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Question:

Explain with the help of suitable example polar covalent bond.

Answer:

If two different atoms are linked to each other by covalent bond, then the shared electron pair will not lie in the centre because the bonding atoms differ in electro-negativities. Such a bond is called as polar covalent bond. In NaCl, chlorine is more electronegative than sodium. Hence it will have more control over the shared pair of electrons and will develops a partial negative charge and sodium will acquire partial positive charge and a polar covalent bond is formed. Greater the difference in electronegativity of bonding atoms, more will be the polarity of the bond.


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