Which of the following gas is opaque to outgoing IR radiations from earths surface?

1.CO2
2.N2O
3.NO2
4.O3
5.H2O Vapour
6.CH4

1
1,3,5 and 6 only
2
1, 2, 4 and 6 only
3
1, 3, 4, 5 and 6 only
4
1, 2, 4, 5 and 6 only 

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