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1.Solution and Colligative properties
medium
$6\,g$ urea is dissolved in $1\,kg$ solvent. Value of $(T_1-T_2)$ will be .......... $^oC.$ $(K_f = 2\, kg\,K\,mol^{-1})$
A
$0.2$
B
$-0.2$
C
$0.1$
D
$-0.1$
Solution
$\mathrm{T}_{1}=$ Freezing point of solvent
$\mathrm{T}_{2}=$ Freezing point of solution
$\Delta \mathrm{T}_{\mathrm{f}}=i \mathrm{K}_{\mathrm{f}} \mathrm{m}$
$\mathrm{T}_{1}-\mathrm{T}_{2}=1 \times 2 \times \frac{6 / 60}{1}$
$\mathrm{T}_{1}-\mathrm{T}_{2}=0.2\,\mathrm{K}$ or $0.2\,^{\circ} \mathrm{C}$
Standard 12
Chemistry
