Q4 / 180 · COMEDK 2023 (Evening Shift) · Chemistry
Choose the incorrect statement:
- Correct answerAHigher the $\mathrm{K}_{\mathrm{H}}$ value for a gas at a given pressure, higher is its solubility in that solvent.
- B$\mathrm{K}_{\mathrm{H}}$ value for a gas present in a given solvent depends on the nature of solute and solvent.
- C$\mathrm{K}_{\mathrm{H}}$ value changes with change in the partial pressure of the gas.
- D$\mathrm{K}_{\mathrm{H}}$ value is temperature dependent.
Solution
By Henry's Law: $p = K_H \cdot x$, where $x$ is the mole fraction (solubility) of gas.
Rearranging: $x = \dfrac{p}{K_H}$
At a given pressure, solubility $x$ is inversely proportional to $K_H$. Higher $K_H$ $\to$ lower solubility.
(1) Incorrect: Higher $K_H$ means lower solubility, not higher.
(2) Correct: $K_H$ depends on the nature of gas and solvent.
(3) Correct: $K_H$ is independent of partial pressure (it is a constant at given temperature).
(4) Correct: $K_H$ is temperature dependent.
Incorrect statement: (1)
Rearranging: $x = \dfrac{p}{K_H}$
At a given pressure, solubility $x$ is inversely proportional to $K_H$. Higher $K_H$ $\to$ lower solubility.
(1) Incorrect: Higher $K_H$ means lower solubility, not higher.
(2) Correct: $K_H$ depends on the nature of gas and solvent.
(3) Correct: $K_H$ is independent of partial pressure (it is a constant at given temperature).
(4) Correct: $K_H$ is temperature dependent.
Incorrect statement: (1)
Hence, the correct answer is option: 'A'.