What volume of 0.05 M `K_(2)Cr_(2)O_(7)` in acidic medium is needed for completel oxidation of 200 " mL of " 0.6 M `FeC_(2)O_(4)` solution?

Options

A. 1.2 mL
B. 1.2 L
C. 120 mL
D. 800 mL

Answer

B

Explanation

`underset(0.05M)(Cr_(2)O_(7)^(2-)+underset((0.6M)/(200mL))(FeC_(2)O_(4)overset(H^(o+))to`
`Cr_(2)O_(7)^(2-)+14H^(o+)+6e^(-)to2Cr_(3+)+7H_(2)O`
`Fe^(2+)toFe^(3+)+e^(-)`,
`C_(2)O_(4)^(2-)to2CO_(2)+2e^(-)`
`FeC_(2)O_(4)toFe^(3+)+2CO_(2)+3e^(-)`
`(0.05xx6)xxV=(0.6xx3)xx200`
`impliesV=1200mL=1.2L`