Question

_________doesn’t supports burning and exhaled during respiration in living

organisms.

(a). Oxygen

(b). Hydrogen

(c)Carbon dioxide

(d).Nitrogen​

Answer 1

Carbon dioxide

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Answer 2

(d) Nitrogen is the correct answer.

1. Nitrogen is an element with atomic number 7 and generally exists as gaseous molecule with formula N2.
2. About 79% nitrogen is present in atmosphere and hence is breathed in by humans.
3. About similar composition is breathed out by humans, with change in oxygen and carbon dioxide concentration in exhaled air.
4. Nitrogen being non flammable gas does not supports burning.