Select the correct order(s) of acidic/basic strength:

Chemistry Classification of Elements and Periodicity Valency and Oxidation State Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 13, 2026

NaOH < Mg(OH) 2 < Al(OH) 3 ; basic strength

H 2 S > H 2 Se > H2Te ; acidic strength and

H 2 SO 3 < H 2 SO 4 ; acidic strength

Both

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The correct answer is:

H 2 S < H 2 Se < H 2 Te (on moving top to bottom, bond

dissociation energy decreases, so acidic strength increases). In case of oxyacids of same element, higher is the oxidation state of the central atom, greater is the acidity. Hence, H 2 SO 4 is a stronger acid than H 2 SO 3 .

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