Question

A current of $9.65A$ flowing for $10$ minutes deposits $3.0g$ of the metal which is monovalent.

The atomic mass of the metal is:

• A. $10$
• B. $50$
• C. $30$
• D. $96.5$

Answer 1

Answer: (B)

$50$

Given,

Current, $i=9.65A$

$t=10min=10\times 60=600s$

$m=3$ g; Oxidation number $=1$

$m=\frac{Z}{F}it$

$3=\frac{At.wt}{oxidationnumber\times F}\times 9.65\times 600$

$Atomicweight=\frac{3\times 1\times 96500}{9.65\times 600}=50$

Hence, the correct option is $\text{B}$.