Read the following statements. (i) I am present in air. (ii) I enter your lungs when you breathe in. (iii) Your body needs me to produce energy. Which of the following gas is being described by the above statements?
(1) Carbon dioxide
(2) Nitrogen
(3) Hydrogen
(4) Oxygen
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It is Oxygen ... option (4)
panasakarla:
Oxygen
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4) oxygen
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