Which of the following solutes decreases the solubility of H₂S in its aqueous solution?

Answer: NaCl
Explanation

Common Ion Effect – NaCl releases Cl⁻ ions, which do not react with H₂S but increase the ionic strength of the solution, reducing H₂S solubility.

Salting-Out Effect – High salt concentration decreases the solubility of gases like H₂S in water by reducing water’s ability to dissolve nonpolar molecules.

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