The standard redox potentials `E^@` of the following systems are `{:("System",E^@("volts")),((i)MnO_4^(-)+BH^(+)+5e^(-)toMn^(2+)+4H_2O,1.51),((ii)Sr^(2+)toSn^(4+)+2e^(-),-0.15),((iii)Cr_2O_7^(2-)+14H^(+)+6e^(-),1.33),((iv)Ce^(3+)toCe^(4+)+e^(-),-1.61):}`
The oxidising power of the various species are related as

Options

A. `Cr_2O_7^(2-) gt MnO_4^(-)`
B. `Ce^(4+) gt Sn^(4+)`
C. `Ce^(4+) gt MnO_4`
D. MnO_4^(-) gt Sn^(4+)`

Answer

B,C,D

Explanation

`S.R.P uarr O.A uarr " " S.R.P=-S.O.P`
`E_(Ce^(+4)|Ce^(+3))^@gtE_(MnO_4^(-)|Mn^(+2))^@gtE_(Cr_2O_7^(-2)|Cr^(+3))^@gtE_(Sn^(+4)|Sn^(+2))^@`
`1. 61` `1.51` `1.33` `0.15`