MCQ practice · SSC Chemistry Board questions · Chapter 6: Concept of Mole and Chemical Counting
What is the molarity of the solution?
Think it through first, then pick an option.
- a 0.5 molar
- b 1 molar
- c 2 molar
- d 2.86 molar
Answer and explanation
Correct answer: c 2 molar
Moles = 20/40 = 0.5; S = 0.5/0.25 = 2 molar.
Why the other options are wrong
- a 0.5 molar: 0.5 is the number of moles (20/40), not divided by the volume; 0.5/0.25 = 2 molar.
- b 1 molar: 1 molar would need 10 g in 250 mL; here there is 20 g, 2 molar.
- d 2.86 molar: 2.86 molar uses a wrong molecular mass; NaOH = 40, giving 2 molar.
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