OnlineCBT
Chemistry · EQUILIBRIUM
हिन्दीGiven below are statements regarding polyprotic acids and factors affecting acid strength: (A) Higher order ionization constants (\( K_{a_2}, K_{a_3} \)) are smaller than the lower order ionization constant (\( K_{a_1} \)). (B) Down a group in the periodic table, the H-A bond strength decreases as the size of atom A increases. (C) Across a period, the acid strength decreases from \( \text{CH}_4 \) to \( \text{HF} \). (D) In a polyprotic acid solution, the primary reaction producing \( \text{H}_3\text{O}^+ \) ions is the first ionization step. Choose the correct answer from the options given below:
Correct answer · Option 2
(A), (B) and (D) only
Explanation
Across a period, acidity increases: \( \text{CH}_4 < \text{NH}_3 < \text{H}_2\text{O} < \text{HF} \), making (C) incorrect. Statements (A), (B), and (D) are all correct.
