Impure copper containing Fe, Au, Ag as impurities is electrolytically refined. A current of 140 A for 482.5 s decreased the mass of the anode by 22.26 g and increased the mass of cathode by 22.011 g. Percentage of iron in impure copper is (Given molar mass Fe= 55.5 g `"mol"^(-1)`, molar mass Cu = 63.54 g `"mol"^(-1)`)

Options

A. iron has less afinity for oxygen at high temperature
B. sulphur has less affinity for oxygen at high temperature
C. copper has more affinity for oxygen than sulphur at high temperature
D. copper has less affinity for oxygen than sulphur at high temperature

Answer

B

Explanation

`2Cu_(2)S+3O_(2) to 2Cu_(2)O+2So_(2)`
`Cu_(2)S+2Cu_(2)O to 6Cu +SO_(2)`