Which of the following statement is correct?

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Lower stratosphere consists of considerable amount of ozone.

Ozone layer protects humans living on earth from the harmful effect of ultraviolet radiations coming from sun.

Ozone is thermodynamically stable.

Smoke clouds play significant role in creating ozone over Antarctica.

answer is B.

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Detailed Solution

(1) No significant amount of ozone forms in the lower part of the atmosphere.(3) Ozone is thermodynamically unstable with respect to oxygen since its decomposition into oxygen results in the liberation of heat (ΔH is negative) and an increase in entropy ( ΔS is positive). These two effects reinforce each other, resulting in large negative Gibbs energy change ( ΔG) for its conversion into oxygen.(4) A cloud of smoke produced by artificial, is considered as smoke cloud.

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