Which of the following represents the correct order of increasing `pK_a` values of the given acids?

Question

Which of the following represents the correct order of increasing `pK_a` values of the given acids?

Which of the following represents the correct order of increasing `pK_a` values of the given acids?
A. `HClO_(4) lt HNO_(3) lt H_(2)CO_(3) lt B(OH)_(3)`
B. `HNO_(3) lt HClO_(4) lt B(OH)_(3) lt H_(2)CO_(3)`
C. `B(OH)_(3) lt H_(2)CO_(3) lt HClO_(4) lt HNO_(3)`
D. `HClO_(4) lt HNO_(3) B(OH)_(3) lt H_(2)CO_(3)`

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Correct Answer - D
Greater the `pK_(a)` value, the weaker is the acid. Perchloric acid `(HCIO_4)` is the strongest acid, followed by nitric acid. Carbonic acid `(H_2CO_3)` the weakest, whereas `B(OH)_3` is somewhat stronger than `H_2CO_3`. The strongest acid has smallest `pK_(a)` value, whereas weakest acid has highest `pK_(a)` value.