When \(H 2 S\) is passed into a solution of iron (III) chlofide, the colour changes form yellow to green. This is because _____________
A. \(H _{2} S\) is reduced to \(S\) B. \(H _{2} S\) ion. are oxidized by \(Fe ^{2+}\) C. \(Fe _{2}{ }^{+}\)ions are oxidized by \(Fe ^{2+}\) ions D. \(Fe ^{2+}\) ions are reduced to \(Fe ^{2}\) ions
Correct Answer: D
Explanation
Hydrogen sulphide reduces a brownish.yellow sptution ef iron(III) chloride to a green solution of iron(II) chloride. The hydrogen sulphide itself is oxidized to sulphurand hydroge chloride. Iron(III) to iron(II) is gain of electron, the process is reduction i.e. \(Fe ^{3+}\) is reduced to \(Fe ^{2+}\)
