Question

Why does sulphur in vapour state exhibits paramagnetic behaviour?

Answer 1

In vapour state sulphur partly exists as S2 molecule and S2molecule like O2 has two unpaired electrons in the anti bonding , orbital and hence exhibit paramagnetism. ... It donates its electron pair and forms a linkage with metal ion.
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Answer 2

The reason behind the paramagnetic behaviour of sulphur is that -

At normal pressure and temperature, the molecule of sulphur stays in the form of S8. But at high temperature, it gets separated and in vapour phase stays in the form of S2 molecule. The S2 molecule has two unpaired electrons.

This is the reason behind the paramagnetic behaviour of sulphur.