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Chemistry · May / June 2023 · Paper 11 · Question 8

5070The mole and the Avogadro constant

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

  1. A0.2 mol of Ca(OH)₂ in 250 cm³ of solution
  2. B0.2 mol of HCl in 100 cm³ of solution
  3. C0.05 mol of H₂SO₄ in 250 cm³ of solution
  4. D0.1 mol of KOH in 1000 cm³ of solution

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Correct answer: C. 0.05 mol of H₂SO₄ in 250 cm³ of solution

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