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1. Solution and colligative properties — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistry1. Solution and colligative properties1 Mark
MCQ
  Column $-I$ (various solutions)   Column $-II$ (Their freezing point )
$a$ $0.1\,M\, BaCl_2$ solution $p$ $271\,K$
$b$ $0.1\,M\, NaCl$ solution $q$ $270\, K$
$c$ $0.1\,M\, K_3 [Fe(CN)_6]$ solution $r$ $268\, K$
$d$ $0.1\,M\, Al_2 (SO_4)_3$ solution $s$ $269\, K$

Given : Freezing point of $0.1\,M$ sucrose solution $= 272\,K$ and $F.pt.$ of water $= 273\,K$
Which of the following option show correct matches ? (assume, molarity=molality)

  • A
    $(a-r),\, (b-p),\, (c-s),\, (d-q)$
  • ✓
    $(a-q),\, (b-p),\, (c-s),\, (d-r)$
  • C
    $(a-q),\, (b-s),\, (c-p),\, (d-r)$
  • D
    $(a-s),\, (b-q),\, (c-r),\, (d-q)$
✓

Answer

Correct option: B.
$(a-q),\, (b-p),\, (c-s),\, (d-r)$
b
Freezing point $\propto \frac{1}{{i \times conc.}}$

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