

MCQOPTIONS
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1. |
Harmful components of air are: |
A. | Oxygen and carbon dioxide |
B. | Carbon dioxide and neon |
C. | show variable oxidation state of \[-1,+1,+3,+5\]and +7 in their various compounds |
D. | Smoke and dust |
E. | None of these |
Answer» E. None of these | |