(a) Which form of sulphur shows paramagnetic behaviour ?
(b) Compounds of fluorine and oxygen are called fluorides and not oxides. Explain.
(c) Sulphur disappears when boiled with an aqueous solution of sodium sulphite. Why ?

Explanation

(a) In vapour state, sulphur partly exists as `S_2` molecules and `S_2` molecule like `O_2` molecule has two unpaired electrons in the antibonding `pi^**-orbitals` and exhibits paramagnetic nature.
(b) This is because of higher electronegativity of flurine than oxygen. In naming a compound, the electronegative element is taken first, thus, the compounds of fluorides and fluorine oxides.
(c) Sulphur combines with sodium sulphite and forms sodium thiosulphate which is soluble in water and hence `S` disappears.