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Which of the following equations correctly represents the boiling point elevation ( ) of a dilute solution?

medium MCQ 1 mark Class 12 · Chemistry · Solutions
  1. A) \,m
  2. B) = i\,\,m
  3. C) \,c
  4. D) = i\,\,c
Answer
B) = i\,\,m

The correct answer is B) = i\,\,m — Check the options: only option B matches this expression.

Step-by-step solution

  1. Identify the colligative property: boiling point elevation depends on the number of solute particles, i.e., the van 't Hoff factor i.
  2. Recognise that the appropriate concentration term is molality (m), not molarity or normality.
  3. Combine these facts: = i\,\,m is the correct expression.
  4. Check the options: only option B matches this expression.
Common mistake: Using concentration (c) instead of molality or omitting the van 't Hoff factor i

Concept tested: Boiling point elevation formula

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