Question

Quantity of in the atmosphere is about [MP PMT 1991; CBSE PMT 1997; RPMT 1997]
A) 0.003%
B) 0.03%
C) 0.3%
D) 3.0%

Answer 1

Perhaps the answer is  (B)  0.03%   Carbon Dioxide  CO2.

The name of the gas is missing in the question.

Atmospheric gases composition is as follows:   
     (these are by volume at atmospheric pressure)

     78%      Nitrogen N2
     21%      Oxygen  O2
     0.93%   Argon  Ar
     0.03%   Carbon dioxide CO2
     0.002%  Neon  Ne
     0.0005%   Helium He
     0.0002%   Methane CH4

Answer 2

Explanation:

Quantity of in the atmosphere is about [MP PMT 1991; CBSE PMT 1997; RPMT 1997]

A) 0.003%

B) 0.03%✔️

C) 0.3%

D) 3.0%