In the ancient atmosphere free nitrogen, oxygen and carbon dioxide were not present because

Of the large amount of hydrogen and high temperatures.

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Carbon would have combined with hydrogen to form methane.

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Any free oxygen would have combined with iron, silicon, aluminium, etc, to form minerals of the earth's crust.

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All of the above.

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Solution

The correct option is D All of the above.
The primitive reducing atmosphere of earth was rich in water vapour, carbon monoxide, carbon dioxide and hydrogen. Absorption of infrared radiation by green house gases ( $C O_{2}$ and $C H_{4}$ ) imparted high temperature to primitive earth. The high temperature, UV light and lightening facilitated reaction between above-mentioned elements. Oxygen did not occur in the free state as the prevailing reduced substances immediately combined with it to form oxides (iron oxides, silicon oxides). Abundant hydrogen combined with free oxygen, nitrogen and carbon to form water, ammonia, methane and cyanides. This makes option D correct.

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