Q. One gram of silver gets distributed between $10\ {cm}^{3}$ of molten zinc and $100cm^{3}$of molten lead at $8000℃.$ The percentage of silver still left in the lead layer in approximately
A) 2
B) 5
C) 3
D) 1
Explanation
(c)
$K_{D} = \frac{concentration\ of\ X\ in\ solvent\ \ A}{concentration\ of\ X\ in\ solvent\ B}$
Concentration of Ag in 10 $cm^{3}$ Zn=x
Concentration of Ag in 100 $cm^{3}$ Pb=$\frac{1 - x}{10}$
Concentration of Ag in 10 $cm^{3}$ Pb=$\frac{1 - x}{10}$
300= $\frac{x \times 10}{(1 - x)}\ \ \ \ \ or\ x = \frac{300}{100} = 0.967\ \ \ \ \ \ \ = 97\%\$
Concentration of Ag in zinc =1 -0.967=0.033
=3.3%
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.