Answer
NaCl is ionic as there is high electronegativity difference, while bond between C and O is covalent, as electronegativities are comparable. N-N bond is covalent for the same reason.
Work Step by Step
NaCl is ionic as there is high electronegativity difference, while bond between C and O is covalent, as electronegativities are comparable. N-N bond is covalent for the same reason.