Helium – oxygen mixture is used be deep sea divers in preference to nitrogen – oxygen mixture because
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a
Helium is much less soluble in blood than nitrogen
b
Nitrogen is much less soluble in blood than helium
c
Due to high pressure deep under the sea nitrogen and oxygen react to give poiso-nous nitric oxide
d
Nitrogen is highly soluble in water
answer is A.
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Detailed Solution
Helium – oxygen mixture is used by deep sea divers in preference to nitrogen – oxygen mixture because helium is much less soluble in blood than nitrogen