Chemistry - Complete P-block Question with Solution | TestHub

The dissociation constant ($K_a$) quantifies acid strength. A larger $K_a$ indicates a greater extent of dissociation, meaning more ${\mathrm{H}}^{+}$ ions are released in solution. Therefore, a greater $K_a$ value corresponds to a stronger acid.

Option A is incorrect because sulfuric acid from the Contact process is typically 98% pure.

Option B is incorrect because pure sulfuric acid is a colorless, dense, oily liquid.

Option C is incorrect because a smaller $K_{a1}$ value would mean less dissociation, not more. ${\mathrm{H}}_2{\mathrm{SO}}_4$ is a strong acid, meaning it dissociates extensively.