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The inert gas which is substituted for nitrogen in the air...

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Chemistry
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The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing is

Answer & Solution
Correct Answer: Option D
Trimix is a mixture of oxygen, nitrogen and helium and is often used at depth in technical diving and commercial diving instead of air to reduce nitrogen narcosis and to avoid the dangers of oxygen toxicity.
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