Answer:
Though Na and H are present in the
group 1, they differ in their electro negativities. The electro negativity of H
is \[2\cdot 1\] and that of Na is \[0\cdot 9\]. Due to large electro negativity
difference between Na and\[Cl\,(3\cdot 0-0\cdot
9=2\cdot 1),\]\[NaCl\] is ionic in nature and exists as a crystalline solid
with very high melting point (800°C). On the other hand, \[HCl\] is polar
covalent due to small electro negativity difference\[(3\cdot 0-2\cdot 1=0\cdot
9)\] and exists in the gaseous state at room temperature. In order to solidify
it, a very low temperature \[(-114{}^\circ C)\] is needed.
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