Question

(iii) Which of the following gas we use in breathing?
(a) Carbon dioxide
(b) Nitrogen
(c) Oxygen
(d) None of these

Answer 1

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Option (c) Oxygen Gas we use in Breathing.

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Answer 2

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Oxygen is the gas we use in breathing. It's simple form is O but when 2 oxygen particle is combined it is called O2 . so basically we breath 2 oxygen particle we say it O2