O-LevelChemistryAcids, Bases & Salts5070/11 · May/June 2023 · Q191 Mark

Samples of HCl(aq) and HNO3(aq) are tested using universal indicator paper. The sample of HCl(aq) has a pH of 4 and the sample of HNO3(aq) has a pH of 2. Which statement is correct?

AHCl(aq) is a weak acid and HNO3(aq) is a strong acid.

BHNO3(aq) has a lower formula mass than HCl(aq).

CThe HNO3(aq) is more concentrated than the HCl(aq).

DThe HCl(aq) has dissociated more than the HNO3(aq).

✓ Correct answer

C: The HNO3(aq) is more concentrated than the HCl(aq).

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Topic: Acids, Bases & Salts, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2023 Paper 1 Variant 1, question 19.

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