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

A. Xenon
B. Krypton
C. Argon
D. Helium
Answer» D. Helium
Explanation: Trimix is a breathing gas, consisting of oxygen, helium and nitrogen, and is often used in deep commercial diving. The helium is included as a substitute for some of the nitrogen, to reduce the narcotic effect of the breathing gas at depth. It helps to reduce nitrogen narcosis and to avoid the dangers of oxygen toxicity. With a mixture of three gases, it is possible to create mixes suitable for different depths or purposes by adjusting the proportions of each gas.
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