MCQ practice · SSC Chemistry Board questions · Chapter 9: Acid-Base Balance
How many grams of H₂SO₄ must be added to neutralise 200 mL of a 0.1 M solution of the alkaline substance produced?
Think it through first, then pick an option.
- a 0.98g
- b 1.96g
- c 4.9g
- d 9.8g
Answer and explanation
Correct answer: b 1.96g
Ca(OH)₂ = 0.1 × 0.2 = 0.02 mol; at 1:1, H₂SO₄ = 0.02 × 98 = 1.96 g.
Why the other options are wrong
- a 0.98g: 0.98 g is only 0.01 mol; 0.02 mol is needed.
- c 4.9g: 4.9 g is 0.05 mol, far more than the 0.02 mol needed.
- d 9.8g: 9.8 g is 0.1 mol; you get it by not converting mL to litres.
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