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Deep-sea divers breathe using a mixture of

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O₂ and H₂

$O_{2}$ and $Ar$

$O_{2}$ and $Kr$

$O_{2}$ and $He$

answer is C.

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Detailed Solution

Breathing pure oxygen will cause cramps due to the high partial pressure of oxygen. When it mixes with He, then He tends to decrease the partial pressure of oxygen which reduces the cramps.

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