Question:

The predominant gas present in the atmosphere is:

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The Earth's atmosphere is mainly Nitrogen and Oxygen. Gases like CO2 are present in very small amounts (parts per million), but they can have a large impact on the climate.

Updated On: Sep 22, 2025

Propane
Butane
Carbon monoxide
Carbon dioxide

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The Correct Option is D

Solution and Explanation

The question is poorly phrased. The most predominant gas in the atmosphere is Nitrogen (78%), followed by Oxygen (21%) and Argon (0.9%). All the options provided are trace gases.

Carbon dioxide ($CO_2$): $\sim$420 ppm (0.042%)
Carbon monoxide (CO): Variable, around 0.1 ppm
Propane ($C_3H_8$) and Butane ($C_4H_{10}$): Extremely low, sub-ppb levels.
Of the choices given, Carbon dioxide is the most abundant.

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