Question

One gram of silver gets distributed between $10c{m}^3$ of molten zinc and $100c{m}^3$ of molten lead at ${800}^{o}C$. The percentage of silver still left in the lead layer is approxiamtely:

• A. $94$
• B. $97$
• C. $69$
• D. $89$

Answer 1

The correct option is B $97$

Mass of $Ag$ in 10 ml molten Zn / mass of ag in 10 ml molten $Pb$

is equal to 300 .

Mass of $Ag$ in 10 ml molten $Pb$ is 1/300 = .0033 g

Now mass of $Ag$ in 10 ml zinc is 1 - .0033 =.9967 %

in $Pb$ is 99.67 and in zinc is .33for 10 ml

Then for $Ag$ in 10 ml zinc is approx 97%.

Hence, the correct option is B.