MCQ practice · SSC Chemistry Board questions · Chapter 6: Concept of Mole and Chemical Counting
How many grams of solute are in 750 mL of 0.1 M sodium carbonate solution?
Think it through first, then pick an option.
- a 3
- b 6.30
- c 7.25
- d 7.95
Answer and explanation
Correct answer: d 7.95
w = (0.1 × 750 × 106)/1000 = 7.95 g.
Why the other options are wrong
- a 3: 3 g would fit about 283 mL; 750 mL holds 7.95 g.
- b 6.30: 6.30 g uses 84, the mass of NaHCO₃; Na₂CO₃ = 106, giving 7.95 g.
- c 7.25: 7.25 g is a slip; (0.1 × 750 × 106)/1000 = 7.95 g.
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