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Redox Reactions

Question
CBSEENCH11006795
Wired Faculty App

Consider the following reactions which produce electricity in a galvanic cell:
left parenthesis straight i right parenthesis space 2 Fe to the power of 2 plus end exponent space plus space Cl subscript 2 left parenthesis straight g right parenthesis space space rightwards arrow space space space 2 Fe to the power of 3 plus end exponent space plus space 2 Cl to the power of minus left parenthesis ii right parenthesis space Cd left parenthesis straight s right parenthesis space plus space straight I subscript 2 space space space rightwards arrow space space space space Cd to the power of 2 plus end exponent space plus space 2 straight I to the power of minus left parenthesis iii right parenthesis space 2 Cr left parenthesis straight s right parenthesis space plus space 3 Cu to the power of 2 plus end exponent space rightwards arrow space space 3 Cu left parenthesis straight s right parenthesis space plus space 2 Cr to the power of 3 plus end exponent
Write the anode and cathode reactions for galvanic cell. Specify the nature of anodes and cathodes. Write the cell in the usual notation.

Solution
bold 1 bold. bold space bold 2 bold Fe to the power of bold 2 bold plus end exponent bold space bold plus bold space bold Cl subscript bold 2 bold left parenthesis bold g bold right parenthesis bold space bold space bold rightwards arrow bold space bold space bold space bold 2 bold Fe to the power of bold 3 bold plus end exponent bold space bold plus bold space bold 2 bold Cl to the power of bold minus bold left parenthesis bold i bold right parenthesis bold space bold Anode bold space bold reaction bold space bold left parenthesis bold Oxidation bold space bold half bold space bold reaction bold right parenthesis bold colon bold space bold space bold space bold space bold space bold 2 bold Fe to the power of bold 2 bold plus end exponent bold space bold space bold space bold space bold rightwards arrow bold space bold space bold space bold space bold 2 bold Fe to the power of bold 3 bold plus end exponent bold space bold plus bold space bold 2 bold e to the power of bold minus bold left parenthesis bold ii bold right parenthesis bold space bold Cathode bold space bold reaction bold space bold left parenthesis bold Reduction bold space bold half bold space bold reaction bold right parenthesis bold space bold space bold space bold space bold space bold space bold space bold space bold Cl subscript bold 2 bold space bold plus bold space bold 2 bold e to the power of bold minus bold space bold space bold rightwards arrow bold space bold space bold space bold 2 bold Cl to the power of bold minus bold therefore bold space bold space bold space bold space bold Cell bold space bold notation bold space bold is bold space bold Fe to the power of bold 2 bold plus end exponent bold space bold vertical line bold space bold Fe to the power of bold 3 bold plus end exponent bold space bold vertical line bold vertical line bold space bold Cl to the power of bold minus bold comma bold space bold space bold Cl subscript bold 2 bold space bold vertical line bold space bold Pt bold left parenthesis bold s bold right parenthesis
bold 2 bold. bold space bold space bold Cd bold left parenthesis bold s bold right parenthesis bold space bold plus bold space bold I subscript bold 2 bold space bold space bold space bold rightwards arrow bold space bold space bold space bold Cd to the power of bold 2 bold plus end exponent bold space bold plus bold space bold 2 bold I to the power of bold minus bold left parenthesis bold i bold right parenthesis bold space bold Andoe bold space bold reaction bold space bold left parenthesis bold oxidation bold space bold half bold space bold reaction bold right parenthesis bold colon bold space bold space bold space bold space bold space bold space bold Cd bold left parenthesis bold s bold right parenthesis bold space bold space bold space bold rightwards arrow bold space bold space bold space bold Cd to the power of bold 2 bold plus end exponent bold space bold plus bold space bold 2 bold e to the power of bold minus bold left parenthesis bold ii bold right parenthesis bold space bold Cathode bold space bold reaction bold space bold left parenthesis bold Reduction bold space bold half bold space bold reaction bold right parenthesis bold colon bold space bold space bold space bold space bold space bold space bold I subscript bold 2 bold space bold plus bold space bold 2 bold e to the power of bold minus bold space bold space bold space bold rightwards arrow bold space bold space bold space bold 2 bold I to the power of bold minus bold therefore bold space bold space bold space bold space bold Cell bold space bold notation bold space bold is bold space bold Cd bold vertical line bold Cd to the power of bold 2 bold plus end exponent bold space bold vertical line bold vertical line bold space bold I to the power of bold minus bold comma bold space bold space bold I subscript bold 2 bold space bold Pt bold left parenthesis bold s bold right parenthesis
bold 3 bold. bold space bold space bold 2 bold Cr bold left parenthesis bold s bold right parenthesis bold space bold plus bold space bold 3 bold Cu to the power of bold 2 bold plus end exponent bold space bold space bold rightwards arrow bold space bold space bold space bold 3 bold Cu bold left parenthesis bold s bold right parenthesis bold space bold plus bold space bold 2 bold Cr to the power of bold 3 bold plus end exponent bold left parenthesis bold i bold right parenthesis bold space bold Anode bold space bold reaction bold space bold left parenthesis bold oxidation bold space bold half bold space bold reaction bold right parenthesis bold colon bold space bold space bold space bold space bold space bold space bold space bold space bold 2 bold Cr bold left parenthesis bold s bold right parenthesis bold space bold rightwards arrow bold space bold space bold space bold 2 bold Cr to the power of bold 3 bold plus end exponent bold space bold plus bold space bold 6 bold e to the power of bold minus bold left parenthesis bold ii bold right parenthesis bold space bold Cathode bold space bold reaction bold space bold left parenthesis bold Reduction bold space bold half bold space bold reaction bold right parenthesis bold. bold space bold space bold space bold space bold space bold space bold space bold space bold space bold space bold 3 bold Cu to the power of bold 2 bold plus end exponent bold space bold plus bold space bold 6 bold e to the power of bold minus bold space bold space bold space bold rightwards arrow bold space bold space bold space bold 3 bold Cu bold left parenthesis bold s bold right parenthesis bold therefore bold space bold space bold Cell bold space bold notation bold space bold is bold space bold Cr bold space bold vertical line bold space bold Cr to the power of bold 3 bold plus end exponent bold vertical line bold space bold vertical line bold vertical line bold space bold Cu to the power of bold 2 bold plus end exponent bold space bold vertical line bold space bold Cu

Some More Questions From Redox Reactions Chapter

Can oxidation occur without reduction?

What are redox reactions?

What are direct redox reactions? Give one example.

What are indirect redox reactions?

Write formulas for the following compounds:
(a) Mercury (II) chloride
(b) Nickel (II) sulphate
(c) Tin (IV) oxide
(d) Thallium (I) sulphate
(e) Iron (III) sulphate
(f) Chromium (III) oxide

What are electrolytes?

What are cations and anions?

What is electrolysis?

Mention two uses of electrolysis.

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