1.

Consider the reaction `:` `Cr_(2)O_(7)^(2-)+14H^(o+)+6e^(-) rarr 2Cr^(+3)+8H_(2)O` What is the quantity of electricity in coulombs needed to reduce `1 mol e` of `Cr_(2)O_(7)^(2-)` ?

Answer» From the reaction,1 mol of `Cr_(2)O_(7)^(2-)` require 6 F
`=6xx96500=579000C`
`therefore579000C` of electrcity are required for reduction of `Cr_(2)O_(7)^(2-)` to `Cr^(3+)`.


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