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CBSE 12th Standard Chemistry Subject Electrochemistry Ncert Exemplar 1 Mark Questions With Solution 2021

Published on: 25/05/2021

QB365 Provides the updated NCERT Exemplar Questions for Class 12, and also provide the detail solution for each and every NCERT Exemplar questions. NCERT Exemplar questions are latest updated question pattern from NCERT, QB365 will helps to get more marks in Exams

Download CBSE Class 12th Standard CBSE Chemistry question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Chemistry

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Std: 12th Standard CBSE - Chemistry

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Questions:

Generic 2

4 x 2 = 8

Write the name of a cell used in small watches.

Why does zinc react with dilute sulphuric acid but copper does not?

Define electrochemical series . or two applications of electrochemical series.

Given that the standard electrode potentials \(\left( { E }^{ 0 } \right) \) of metals are :
\({ K }^{ + }/K=-2.93V,{ Ag }^{ + }/Ag=0.80V,\) \({ Cu }^{ 2+ }/Cu=0.34V,{ Mg }^{ 2+ }/Mg=-2.37V\) \({ Cr }^{ 3+ }/Cr=-0.74V,{ Fe }^{ 2+ }/Fe=-0.44V\)
Arrange these metals in an increasing order of their reducing power.

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Answers Key:

Generic 2

4 x 2 = 8

Mercury cell (Rubon-Mallory cell).

Zinc lies above hydrogen whereas copper lies below hydrogen in the electrochemical series. Hence, zinc is more reactive than H⁺whereas copper is less reactive. Therefore, zinc reacts with dilute H₂SO₄ but copper cannot liberate H₂gas by reaction with dilute H₂SO₄

The arrangement of various electrodes in the decreasing or increasing order of their standard reduction potentials is called electrochemical series.
or Two applications of electrochemical series are :
(i) To compare oxidizing or reducing powers of different elements
(ii) To predict the spontaneity of any redox reaction.

Higher the oxidation potential more easily it is oxidised and hence stronger is the reducing power. Therefore order is Ag < Cu < Fe < Mg < K.