AIIMS 2006
- Exam
- AIIMS
- Year
- 2006
- Subject
- Chemistry
- Chapter
- Solutions
AIIMS 2006 · Chemistry · Solutions
A 5 \% solution (by mass) of cane sugar in water has freezing point...
A solution (by mass) of cane sugar in water has freezing point of and freezing point of pure water is . The freezing point of a solution (by mass) of glucose in water is
Options
- A
- B
- C
- D.
Correct answer
C.
Step-by-step solution
: K_f=\frac{\Delta T_f \times W \times m}{1000 \times w}W=w=m=\frac{2.15 \times 100 \times 342}{1000 \times 5}=5 \%\begin{aligned}& \DeltaT_f=\frac{K_f \times 1000 \times w^{\prime}}{W \times m^{\prime}}\left(\text{ where })w^{\prime}=\right.\text{ wt. of glucose, }\\
&m^{\prime}=\text{ molecular wt. of glucose }\right)\\
&=\frac{14.7 \times 1000 \times 5}{100 \times 180}=4.08
\end{aligned} Freezing point of glucose solution .