COMEDK · Chemistry · 17. Solutions

Study the graph between partial pressure and mole fraction of some gases and arrange the gases P, Q, R and S dissolved in H\(_2\)O, in the decreasing order of their K_H values.

A R > Q > P > S
B Q > R > P > S
C P > R > S > Q
D S > P > R > Q

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Answer & Solution

Correct Answer

(D) S > P > R > Q

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Detailed explanation

According to Henry's Law, the partial pressure \(p\) of a gas is related to its mole fraction \(x\) in the solution by the equation \(p = K_H \cdot x\), where \(K_H\) is the Henry's Law constant. The given graph plots partial pressure on the y-axis and mole fraction \(x\) on the…

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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Study the graph between partial pressure and mole fraction of some gases and arrange the gases P, Q, R and S dissolved in H\(_2\)O, in the decreasing order of their KH values.

Step-by-step Solution

Study the graph between partial pressure and mole fraction of some gases and arrange the gases P, Q, R and S dissolved in H\(_2\)O, in the decreasing order of their K_H values.