Q. 315.0( 2 Votes )

(a) What is the atomicity of sulphur?
(b) How do you bring the change of rhombic sulphur to monoclinic sulphur and vice versa?
(c) What is the action of conc. HNO3 on sulphur?

Answer :

(a) Atomicity of sulphur is 8. Its formula is S8.(b) Rhombic sulphur, when heated to above 369K, changes to monoclinic sulphur. Monoclinic sulphur, on cooling to below 369 K reverts back to rhombic sulphur.
Rhombic sulphur Monoclinic sulphur(c) Conc. HNO3 oxidises sulphur to sulphuric acid while the former is reduced to NO2.
S(s) + 6HNO3(aq) H2SO4(aq) + 6NO2(g) + 2H2O(l).

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