Which of the following formulae is used to obtain depression in freezing point?

Which of the following formulae is used to obtain depression in freezing point?
  1. $\Delta \mathrm{T}_{\mathrm{f}}=\frac{\mathrm{T}_{\mathrm{f}}^{\circ}}{\mathrm{T}_{\mathrm{f}}}$
  2. $\Delta \mathrm{T}_{\mathrm{f}}=\mathrm{T}_{\mathrm{f}}^{\circ}-\mathrm{T}_{\mathrm{f}}$
  3. $\Delta \mathrm{T}_{\mathrm{f}}=\mathrm{T}_{\mathrm{f}}-\mathrm{T}_{\mathrm{f}}^{\circ}$
  4. $\Delta \mathrm{T}_{\mathrm{f}}=\frac{\mathrm{T}_{\mathrm{f}}}{\mathrm{T}_{\mathrm{f}}^{\circ}}$

Solution

$\Delta \mathrm{T}_{\mathrm{f}}=\mathrm{T}_{\mathrm{f}}^{\circ}-\mathrm{T}_{\mathrm{f}}$ Where, $\mathrm{T}_{\mathrm{f}}^{\circ}=$ freezing point of pure solvent $T_f=$ freezing point of solution.

Asked in: MHT CET 2021 (22 Sep Shift 2)

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