MCQ practice · SSC Chemistry Board questions · Chapter 6: Concept of Mole and Chemical Counting
How many grams of NaCl are dissolved in the solution of B?
Think it through first, then pick an option.
- a 2.925 g
- b 2.325 g
- c 23.25 g
- d 29.25 g
Answer and explanation
Correct answer: a 2.925 g
w = (0.2 × 250 × 58.5)/1000 = 2.925 g.
Why the other options are wrong
- b 2.325 g: 2.325 g jumbles the digits; the value is 2.925 g.
- c 23.25 g: 23.25 g has both the digits and the decimal wrong; the answer is 2.925 g.
- d 29.25 g: 29.25 g is ten times too much, the solute for 2.5 liters; 250 mL holds 2.925 g.
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