Question:medium

Which of the following gases at 298 K and 1 atm pressure is having maximum solubility in water?
(A) Methanal, KH = 0.000018
(B) Argon, KH = 40.3
(C) Methane, KH = 0.41
(D) CO2, KH = 1.6
Choose the correct answer from the options given below:

Updated On: Jan 16, 2026
  • Methanal
  • Argon
  • Methane
  • CO₂
Show Solution

The Correct Option is A

Solution and Explanation

To identify the gas with the highest solubility in water at 298 K and 1 atm pressure, we examine the provided Henry's law constants, \( K_H \). Henry's law establishes a relationship between a gas's solubility in a liquid and its partial pressure above the liquid, expressed as:

Solubility \( \propto \frac{1}{K_H} \)

Consequently, a lower \( K_H \) value signifies greater solubility. Let's compare the \( K_H \) values for the given options:

Gas\( K_H \) (atm)
Methanal0.000018
Argon40.3
Methane0.41
CO21.6

Methanal exhibits the lowest \( K_H \) value among the options at 0.000018 atm, indicating it possesses the maximum solubility in water.

Thus, the correct choice is: Methanal

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