Question

$965$ amp current is passed through molten metal chloride for one minute and $40$ seconds during electrolysis. The mass of metal deposited is $9gm$ at the cathode. The valency of metal atom (at.wt$=27$) is:

• A. $4$
• B. $3$
• C. $2$
• D. $1$

Answer 1

Answer: (B)

$3$

$Massdeposited=\frac{Atomicweight\times i\times t}{nfactor}$

Deposited mass of metal $=9g$

Time $=$ 1 min 40 sec $=100sec$

Atomic weight of the metal $=27$

Current, $i=965A$

$9=\frac{27\times 965\times 100}{n\times 96500}$

$n=3$