Instead of Nitrogen, Helium is added to oxygen used by deep sea divers because :
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a
It is less soluble in blood than nitrogen under high pressure
b
It is lighter than nitrogen
c
It is readily miscible with oxygen
d
It is less poisonous than nitrogen
answer is A.
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Detailed Solution
It is less soluble in blood than nitrogen under high pressure. If nitrogen is taken then it will start getting soluble in blood and decreases the oxygen levels in turn.