Consider the reaction: C r 2 O 7 2 – + 14 H + + 6 e – – –

NCERT Class XII Chemistry
Chapter - Electrochemistry
Questions with Solutions

Question : 30 of 32

Marks: +1, -0

Consider the reaction: Cr2O72–+14H++6e––––––▶2Cr3++7H2O
What is the quantity of electricity in coulombs needed to reduce 1 mol of Cr2O72– ?

Solution:

Cr2O72–+14H++6e– –––––▶2Cr3++7H2O,

6×96500C=579000C of electricity is required to reduce 1 mol of Cr2O72–.

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