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The inert gas which is substituted for nitrogen in the air,
used by deep sea divers for breathing, is
1 Helium
2 Argon
3 Krypton
4 Xenon
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- Argon, I also Faced
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Which of the following was to be discovered first in the chromo sphere of the sun? 1 Xenon 2 Helium 3 Neon 4 Krypton
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Carbon tetrachloride fire extinguisher should not be used in closed rooms, because it produces a poisonous gas called 1 Carbon monoxide 2 Phosphine 3 Phosgene 4 None of these
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hai i am koti reddy panta.studying 3rd mca.i failed in my degree. shell i consider those subjects as backlogs
Biological Sciences 
