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A polar covalent bond always means 50% ionic and 50% covalent characteristics. No.
The percentage ionic character in a covalent molecule is mostly dependent on the difference in electronegativity between the bonding atoms. Also, the greater the electronegativity difference, higher is the ionic character in a covalent molecule. So, the percentage ionic character in a covalent bond can vary anywhere between 0 and 100.
