Atmosphere contains 21 % of which gas? 1. Nitrogen 2. Oxygen 3. Phos – McqOptions

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1.	Atmosphere contains 21 % of which gas? 1. Nitrogen 2. Oxygen 3. Phosphorous
A.	1 only
B.	2 only
C.	3 only
D.	None of the Above
Answer» C. 3 only

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