Verified Answer :

Hagrid

If the electronegativity difference is less than 1.6 or when the difference is 1.6 - 2.0 and it only involves nonmetal, then the molecule contains a covalent bond.
A. HF: 4.0 - 2.1 = 1.9 (Covalent)
B. LiCl: 3.16 - 0.96 = 2.2 (Non-covalent)
C. CN-: 3.04 - 2.65 = 0.39 (Covalent)
D. MgO: 3.44 - 1.31 = 2.13 (Non-covalent)

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Answer:

C APEX APPROVED

Explanation:

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