The inert gas which is substituted for nitrogen in the air used by deep sea dive

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

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1) Which of the following does not contain a coinage metal?

2) The age of most ancient geological formations is estimated by

3) Epoxy resins are used as

4) Marsh gas is

5) Which metal pollute the air of a big city?