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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
For increase in difference between  $P_A^ o$  and  $P_A$
  • A
    boiling point and freezing point both increase
  • B
    boiling point and freezing point both decrease
  • ✓
    boiling point increase, freezing point decrease
  • D
    boiling point decrease, freezing point increase
✓

Answer

Correct option: C.
boiling point increase, freezing point decrease
c
$\mathrm{P}_{\mathrm{A}}=\mathrm{X}_{\mathrm{A}} \times \mathrm{P}_{\mathrm{A}}^{0}$

$\mathrm{X}_{\mathrm{A}}$ decreases,              $\therefore$ Solute increases

$\uparrow \Delta \mathrm{T}_{\mathrm{b}}=\mathrm{m} \uparrow \mathrm{k}_{\mathrm{b}}$

$\uparrow \Delta \mathrm{T}_{\mathrm{f}}=\uparrow \mathrm{m} \mathrm{k}_{\mathrm{f}}$

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