Multiple Choice Question Answer IV — task. Science CBSE, Class 9.

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1. Which of the following gases contributes maximum to the 'Greenhouse effect' on earth?

Carbon dioxide
Freon
Chlorofluorocarbon
Methane

2. Which of the following is not a "Greenhouse gas" ?

$N_2$
$SO_2$
$CH_4$
$CO_2$

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