TN TET 2012 Paper 2 Social and Science Paper

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Question : 103 of 150

Marks: +1, -0

Which one of the following is the correct combination of the components of air?

Nitrogen – 21%, Oxygen – 78%, Other gases – 1%
Nitrogen – 1%, Oxygen – 78%, Other gases – 21%
Nitrogen – 78%, Oxygen – 21%, Other gases – 1%
Nitrogen – 78%, Oxygen – 1%, Other gases – 21%

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