Question

A current of 2.0 ampere passed for 5 hour through a molten salt deposits 22 g of the metal (Atomic mass = 177). The oxidation state of the metal in the metal salt is

Options

• +1

• +3

• +2

• +4

Answer 1

+3

Explanation:

Q = It = 2 amp × 5 × 60 × 60s = 36000c

Equivalent mass of metal = `(22.2  g)/(3600 c) xx 96500` C = 59.5 g

Valency of the metal = `"Atomic  mass"/"Equivalent mass"`

= `177/59.5` = 3