Question

Compare boiling point of given solutions:
(i) \( 10^{-4} \) NaCl
(ii) \( 10^{-3} \) NaCl
(iii) \( 10^{-2} \) NaCl
(iv) \( 10^{-4} \) urea

• A. \( i>ii>iii>iv \)
• B. \( iii>ii>i>iv \)
• C. \( ii>i>iii>iv \)
• D. \( iii>ii>i>iv \)

Hint:

Boiling point elevation is directly related to the molality of the solution and the number of dissociated particles.

Answer 1

The Correct Option is B

The boiling point elevation depends on the number of solute particles in the solution. NaCl dissociates in water into ions, so the greater the concentration of NaCl, the higher the boiling point elevation. Urea does not dissociate into ions, so its boiling point elevation will be less than that of NaCl at the same concentration.