${{\rm{K}}_3}{\rm{Fe}}{\left( {{\rm{CN}}} \right)_6}$ is used as ……. Indicator for ${\rm{FeS}}{{\rm{O}}_4}vs.{{\rm{K}}_2}{\rm{C}}{{\rm{r}}_2}{{\rm{O}}_7}$ titrations.

JEE CHEMISTRY MCQ: d & f- BLOCK ELEMENTS

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{\mathrm{K}_3}\mathrm{Fe}{\left( {\mathrm{CN}} \right)_6}

is used as ……. Indicator for

\mathrm{FeS}{\mathrm{O}_4}vs.{\mathrm{K}_2}\mathrm{C}{\mathrm{r}_2}{\mathrm{O}_7}

titrations.

View answer and explanation

Correct option: B

External

Option B (External) is correct because

{\mathrm{K}_3}\mathrm{Fe}{\left( {\mathrm{CN}} \right)_6}

reacts with

\mathrm{FeS}{\mathrm{O}_4}

internally, so it must be used externally.