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Q.

Which of the following pair of gases are colorless and odourless in nature?

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a

O2 ; NH3

b

I2 ;  Cl2

c

O2 ; CO2

d

CO2 ; SO2

answer is A.

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Detailed Solution

 Colorless and odourless gases →O2;CO2;N2

 Colorless gases with odour gases →NH3;SO2;HCl;H2S

Colored gases → NO2 (Brown) ; Br2 (Reddish Brown)  I2 (Violet)   ; Cl2 (Greenish Yellow)

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