The important gas which was absent during the formation of earth is

Oxygen gas

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Hydrogen gas

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Nitrogen gas

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Carbon dioxide gas

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Solution

The correct option is A Oxygen gas
According to Oparin, the atmosphere of primitive earth was reducing because the hydrogen atoms were most numerous and most reactive. Large quantities of hydrogen gas, nitrogen gas, carbon dioxide, methane, water vapour and ammonia were present but free oxygen was not present in significant amount.
Hence, oxygen was absent during the formation of earth. So, the correct answer is 'Oxygen gas'.

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