Multiple choice

Which of the following pair of ‘compounds - their respective nature’ is not correctly matched?

  1. Carbon dioxide - acidic

  2. SiO2 - acidic

  3. Alumina - Amphoteric

  4. Caro’s acid - dibasic

  5. Sulphuric acid - dibasic
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D Correct answer
Explanation

Caro’s acid (H2SO5) is monobasic on account of the presence of one replaceable hydrogen atom. The presence of one replaceable hydrogen atom is explained by the example of potassium peroxymonosulfate (KHSO5) which is formed by the reaction of H2SO5 with alkali. It is the potassium acid salt of peroxymonosulphuric acid and is widely used as an oxidising agent.

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