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Question
Which of the followings pair does not consist of greenhouse gases?
Options:
A .  Water vapour and CO2
B .  CO and O3 
C .  CH4 and Nitrous Oxide
D .  Chloroflurocarbons and CO2
Answer: Option B
:
B
Except CO, all other gases act as greenhouse gas.
Points to remember:Greenhouse gases - CO2,O3,CH4, Nitrous Oxide and CFC's

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