Question

Which of the following statement is correct?

A
Allotropy of sulphur arises partly because of the great variety of molecular forms that can be achieved by -S-S- catenation and partly because of the numerous ways in which the molecules so formed can be arranged within the crystal
B
Both rhombic and monoclinic sulphur have S8 molecules and therefore, possess same value of specific gravities
C
Ozone on reaction with KI solution buffered with a borate buffer (pH 9.2) yields potassium iodate
D
The ozone layer protects the earth's surface from an excessive concentration of mainly infrared (IR) radiations

Solution

The correct option is A Allotropy of sulphur arises partly because of the great variety of molecular forms that can be achieved by -S-S- catenation and partly because of the numerous ways in which the molecules so formed can be arranged within the crystal2) Rhombic and monoclinic sulphur with specific gravity 2.06 and 1.98 are interconvertible at 396K.3) $$2I^-(aq) + H_2O(\ell) + O_3(g) \rightarrow 2OH^-(aq) + I_2(s) + O_2(g)$$ Ozone do not give potassium iodateon reaction with KI.4) Ozone layer protects the earth's surface form ultraviolet radiation.Hence, option A is correct.Chemistry

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