MCQ practice · SSC Chemistry Board questions · Chapter 6: Concept of Mole and Chemical Counting
What is the molarity of that solution?
Think it through first, then pick an option.
- a 0.589 molar
- b 0.594 molar
- c 0.75 molar
- d 0.759 molar
Answer and explanation
Correct answer: c 0.75 molar
Moles = 15.75/84 = 0.1875; S = 0.1875/0.25 = 0.75 molar.
Why the other options are wrong
- a 0.589 molar: 0.589 uses a wrong molecular mass; NaHCO₃ = 84, giving 0.75 molar.
- b 0.594 molar: 0.594 is a slip; (15.75/84)/0.25 = 0.75 molar.
- d 0.759 molar: 0.759 is slightly too high; the value is 0.75 molar.
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