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Redox Reactions

Question
CBSEENCH11006803
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What is electrochemical series? What are its important applications?

Solution
The table in which the reduction potential of various electrodes has been arranged in the increasing order is called electrochemical series. The standard reduction potential of hydrogen electrode is zero. The electrodes above hydrogen have negative reduction potential while those placed below it have positive reduction potential.

Applications:
(i) To predict the relative oxidising and reducing powers: Greater the reduction potential, more easily the substance is reduced and hence is a stronger oxidising agent. For example oxidising powers of halogens are F2 > Cl2 > Br2 > I2.
(ii) To predict whether a metal will react with acid to give H2 gas : Metals above hydrogen in the series displace hydrogen from acids.
(iii) To calculate the standard E.M.F. of the cell
straight E subscript cell superscript degree space equals space straight E subscript cathode superscript degree space minus space straight E subscript anode superscript degree
(iv) To predict the spontaneity of any redox reaction: If E.M.F. of the cell is positive, it is spontaneous, otherwise not.


Some More Questions From Redox Reactions Chapter

What is an oxidising agent (electronic concept)?

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?

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Mock Test Series

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