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Which gas is used to improve the atmosphere of the crowded places ?
A. `H_2`
B. `O_2`
C. `O_3`
D. `N_2 O`

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Correct Answer - C
`O_3 rarr O_2 + [O]`
`O_3` decomposes to produce `O_2`, thus improves tha air of crowded places.

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