Q.

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

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a

O2 ; CO2

b

O2 ; NH3

c

CO2 ; SO2

d

I2 ;  Cl2

answer is A.

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Detailed Solution

Colorless and odourless gases →O2;CO2;N2 Colorless gases with odour gases →NH3;SO2;HCl;H2SColored gases → NO2 (Brown) ; Br2 (Reddish Brown)  I2 (Violet)   ; Cl2 (Greenish Yellow)
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