# Give reasons for the following :(a) Dioxygen is a gas but sulphur a solid.(b) NO (g) released by jet airplanes is slowly depleting the ozone layer.(c) Interhalogens are more reactive than pure halogens

(a) The intermolecular forces in oxygen are weak Vander Waal's forces which cause it to exist as a gas but in Sulphur the atoms are held together by strong covalent bonds.

(b) NO released by jet aeroplanes gets converted into nitric oxide that causes depletion of the ozone layer.

$NO+O_{2}\rightarrow NO_{2}+O_{2}$

(c) It is so because $x={x}'$ bond between dissimilar electronegative elements is weaker than the bond between two similar atoms  $x-{x}$ due to less effective overlapping of orbitals in case of two dissimilar atoms.

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