MHT CET · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Which mixture is used for respiration by deep sea divers?

A $N e + O_{2}$
B $K r + O_{2}$
C $A r + O_{2}$
D $H e + O_{2}$

Verified Solution

Answer & Solution

Correct Answer

(D) $H e + O_{2}$

Step-by-step Solution

Detailed explanation

Scuba divers must cope with high concentrations of dissolved gases while breathing air at high pressure, underwater. Increased pressure increases the solubility of atmospheric gases in blood. When divers come towards surface, the pressure gradually decreases. This called bends. To avoid bends, the tanks are used by scuba divers that are filled with air diluted with helium (11.7% helium, 56.2% nitrogen and 32.1% oxygen). Thus, option

(d)

is correct.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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