The element indium is to be obtained by electrolysis of a molten halide of the element. Passage of a current of 3.20 A for a period of 40.0 min results in formation of 3.05 g of In. What is the oxidation state of indium in the halide melt ? (At.wt of In = 114.81)

Answer

3

Explanation

`3.2 xx 40 xx 60c to 3.05 gm , n xx 96500 c to 114.81`
On cross multiplication
` n xx 96500 xx 3.05 to 114.81 xx 3.2 xx 40 xx 60`
` n xx 96500 to (114.81 xx 3.2 xx 40 xx 60)/(3.05) , n to (114.81 xx 3.2 xx 2400)/(3.05 xx 96500)` oxidation state n =3