Question
Explain with help of suitable example polar covalent bond.
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Answer
Polar covalent bond : It is an ideal situation for a bond to be $100 \%$ ionic or covalent. But in reality no bond or compound is completely covalent or ionic.
When a covalent bond is formed between two similar atoms (like $H _2, O _2, Cl _2, N_2$ and $F _2$ ) then the valence electron pair is equally attracted by both atoms. Due to this, the electron pair is located exactly in middle of two identical nuclei. The bond thus obtained is called non-polar covalent bond. On the contrary, in a hetero-atomic molecule like HF, the shared electron pair between two atoms gets displaced towards the more electronegative atom fluorine. This bond is called polar covalent bond.
When a covalent bond is formed between two similar atoms (like $H _2, O _2, Cl _2, N_2$ and $F _2$ ) then the valence electron pair is equally attracted by both atoms. Due to this, the electron pair is located exactly in middle of two identical nuclei. The bond thus obtained is called non-polar covalent bond. On the contrary, in a hetero-atomic molecule like HF, the shared electron pair between two atoms gets displaced towards the more electronegative atom fluorine. This bond is called polar covalent bond.
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