Objective Type Questions \( \mathrm{P} \) Earth is protected from U...

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Objective Type Questions
\( \mathrm{P} \)
Earth is protected from UV rays by
(1) \( \mathrm{N}_{2} \)
(2) \( \mathrm{O}_{2} \)
(3) \( \mathrm{O}_{3} \)
(4) \( \mathrm{SO}_{3} \)
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