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  4. HCl gas is covalent and NaCl is an ionic compound. This is because

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Q. $HCl$ gas is covalent and $NaCl$ is an ionic compound. This is because

KCETKCET 2016Chemical Bonding and Molecular Structure

Solution:

$HCl (g)$ is covalent whereas $NaCl$ is an ionic solid due to small difference in their electronegativities.

In HCl, the difference in electronegativity of $H$ and Cl-atoms is less than $2.10$, whereas in $NaCl$, the difference in electronegativities of Na and Cl-atoms is more than $2.10$.

Electronegativity of $( Cl )=3.00$ (approx. value)

Electronegativity of $( Na )=0.88$ (approx. value)

Electronegativity difference $=2.12$