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Question

Polar covalent bond is present in:

A
NaCl
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B
Ca3N2
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C
K3N
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D
F2
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E
NH3
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Solution

The correct option is E NH3
Electronegativity DifferenceType of Bond Formed




0.0 to 0.2 nonpolar covalent
0.3 to 1.4 polar covalent
> 1.5 ionic
The electronegativity difference provides a way of predicting the kind of bond that will form between two elements.
NaCl Electron negativity difference =0.93.0=2.1(ionic bond)
Ca3N2 Electronegativity difference =1.03.0=2 (ionic bond)
K3N Electronegativity difference =0.83.0=2.2 (ionic bond)
F2 Electronegativity difference =4.04.0=0 Bond = Non-polar covalent
NH3 Electronegativity difference =3.02.1=0.9 Bond = Polar covalent

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