Question

A current of 9.65 ampere flowing for 10 minutes deposits 3.0 g 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

Answer 2

$Q = It$ $= 9.65 \times 10\times 60$ $= 5790\,C$ $\underset{\text{monovalent metal}}{M^+} + \underset{1F , 96500\,C}{e} {->} \underset {1\,mole}{M}$ With $5790 \,C$, amount of metal deposited $= 3\, gm$ With $96500 \,C$, amount of metal deposited $= \frac{3}{5790} \times 96500$ $= 50\,g$(equivalent weight) Atomic mass $= 50 \times$ valency $= 50 \times 1 = 50$ amu