Q10 / 97 · NTA Abhyas (JEE Main) 2020 · Chemistry · Solutions

Identify the correct statement:

  • A
    0.1 M NaCl and 0.1 M glucose solution are isotonic.
  • B
    0.1 M NaCl and 0.3 M glucose solution are isotonic.
  • Correct answer
    C
    The boiling point of 0.1 m aqueous urea solution is less than 0.1 m aqueous KCl solution.
  • D
    The freezing point of 0.1 m glucose solution is less than 0.1 m KCl solution.

Solution

π NaCl  = i ×  CRT π glucose  = 1 ×  0.1 × RT
= 2 × 0.1 RT = 0.1 RT
=0.2 RT
πNaCl≠πglucos⁡e
ΔT b NaCl =2×0.1  K f ;   ΔT b urea =0.1  K f
Hence, ΔTburea<ΔTbNaCl

Hence, the correct answer is option: 'C'.

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