O-LevelChemistryStoichiometry5070/11 · May/June 2023 · Q81 Mark

Two aqueous solutions, Q and R, have the same concentration in mol/dm³. Solution Q contains 4.0g of NaOH in 500 cm³ of solution. Which solution could be solution R? [Ar: Na, 23; Ο, 16; Η, 1]

A0.2 mol of Ca(OH)2 in 250 cm³ of solution

B0.2 mol of HCl in 100 cm³ of solution

C0.05 mol of H2SO4 in 250 cm³ of solution

D0.1 mol of KOH in 1000 cm³ of solution

✓ Correct answer

C: 0.05 mol of H2SO4 in 250 cm³ of solution

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Topic: Stoichiometry, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2023 Paper 1 Variant 1, question 8.

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