General Science Paper

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

A. Argon

B. Xenon

C. Helium

D. Krypton

May 11th, 2014

C. Helium 

May 11th, 2014

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May 11th, 2014
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May 11th, 2014
Sep 21st, 2017
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