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Q.

What is the composition of gases in the tanks used by the scuba divers?

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a

11.7% helium    56.2% nitrogen    32.1% oxygen

b

56.2% helium    11.7% nitrogen     32.1% oxygen

c

11.7% helium     32.1% nitrogen     56.2% oxygen

d

56.2% helium         32.1 % nitrogen     11.7% oxygen

answer is B.

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Detailed Solution

Air diluted with helium, i.e. a mixture of 11.7% helium, 56.2% nitrogen and 32.1 % oxygen, is present in the tanks used by scuba divers for respiration.

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