Weak acids are partially ionized in aqueous solutions. The ionization constants of some acids are given below. Arrange these acids in increasing order of their acid strength. Index Acid Ionisation constant (K_a) 1 Formic acid (HCOOH) 1.8\times10^{-4} 2 Hypochlorous acid (HClO) 3.0\times10^{-8} 3 Nitrous acid (HNO_2) 4.5\times10^{-4} 4 Hydrocyanic acid (HCN) 4.9\times10^{-10}

Correct Answer is : 4 < 2 < 1 < 3

AP EAMCET Engineering 22 Sep 2020 Shift 2 Paper

Section: Chemistry

Question : 150 of 160

Marks: +1, -0

Weak acids are partially ionized in aqueous solutions. The ionization constants of some acids are given below. Arrange these acids in increasing order of their acid strength.

Index	Acid	Ionisation constant (Ka)
1	Formic acid (HCOOH)	1.8×10−4
2	Hypochlorous acid (HClO)	3.0×10−8
3	Nitrous acid (HNO2)	4.5×10−4
4	Hydrocyanic acid (HCN)	4.9×10−10

4 < 2 < 1 < 3
1 < 2 < 3 < 4
2 < 3 < 1 < 4
4 < 3 < 2 < 1

Validate

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