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

Argon

Xenon

Helium

Krypton

Explanation:

It always has a 21:79 ratio of oxygen to nitrogen; the balance of the mix is helium. Hydreliox is a mixture of oxygen, helium, and hydrogen and is used for divesbelow 130 metres in commercial diving. Hydrox, agas mixture of hydrogen and oxygen, is used as abreathing gas in very deep diving.

By: DATTA DINKAR CHAVAN

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