MCQ practice · SSC Chemistry Board questions · Chapter 6: Concept of Mole and Chemical Counting
What is the concentration of the solution?
Think it through first, then pick an option.
- a 0.025 M
- b 0.25 M
- c 0.526 M
- d 0.625 M
Answer and explanation
Correct answer: d 0.625 M
Moles = 5/40 = 0.125; S = 0.125/0.2 = 0.625 M.
Why the other options are wrong
- a 0.025 M: 0.025 M misplaces the decimal; (5/40)/0.2 = 0.625 M.
- b 0.25 M: 0.25 M would need 500 mL; here it is 200 mL, so 0.625 M.
- c 0.526 M: 0.526 M is a slip; 0.125 mole ÷ 0.2 L = 0.625 M.
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