Which of the following statement is correct? (a) Lower stratosphere consists of considerable amo...

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Which of the following statement is correct?
(a) Lower stratosphere consists of considerable amount of ozone.
(b) Ozone layer protects humans living on earth from the harmful effect of ultraviolet radiations coming from sun.
(c) Ozone is thermodynamically stable.
(d) Smoke clouds play significant role in creating ozone over antarctica.
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