Electrochemical Cells

IMPORTANT

Electrochemical Cells: Overview

This topic covers concepts such as Electrochemistry and Electrochemical Cell.

Important Questions on Electrochemical Cells

HARD
IMPORTANT

A cell, Ag|A g + C u 2+ |Cu, initially contains 1 M A g +  and 1   MC u 2+ ions.

Calculate the change in the cell potential after the passage of 9.65 A of current for 1 h.

HARD
IMPORTANT

How many grams of silver could be plated out on a serving tray by electrolysis of a solution containing silver in +1 oxidation state for a period of 1.0 hours at a current of 8.46 amperes? What is the area of the tray if the thickness of the silver plating is 0.00254 cm? Density of silver is 10.5gc m 3 .

MEDIUM
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The reaction :

 12H2(g)+AgCl (s)H+(aq)+Cl(aq)+Ag (s)  occurs in the galvanic cell

MEDIUM
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The standard e.m.f. of a galvanic cell involving cell reaction with n = 2 is found to be 0.295 V at   25°C.  The equilibrium constant of reaction would be –

EASY
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An electrochemical cell in which electrical energy is produced involving transfer of matter only is called a concentration cell.

EASY
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Name the different types of electrochemical cells.

EASY
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Define electrochemistry.

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Secondary battery is a cell which can be _____  repeatedly for use. Examples are Lithium-ion battery, Lead Storage battery, etc.

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In an electrochemical cell, reduction occurs at anode.

EASY
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A half cell is connected with SHE, during the course of reaction pH of SHE is increased. The connected half cell behaves as

MEDIUM
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In the cell represented PbsPb1M2+Ag1M+Ags, the reducing agent is

MEDIUM
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A variable, opposite external potential (Eext) is applied to the cell Zn | Zn2+ 1MCu2+ 1 M| Cu , of potential 1.1 V. When Eext<1.1 V and Eext>1.1 V , respectively electrons will flow from:

MEDIUM
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In which of the following electrochemical cell the overall cell reaction is :

Zns+H2SO4 aq ZnSO4 aq+H2 g

MEDIUM
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In which of the following electrochemical cell overall cell reaction is :

HgO s+H2 g Hg l+H2O l

EASY
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In which of the following cells net cell reaction is :

Ag+ aq+Cl aq AgCl s

EASY
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In a galvanic cell, the electrons flow from

EASY
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What flows in the internal circuit of a galvanic cell?

EASY
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The electrochemical cell stops working after sometimes because:

EASY
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What are the anode and cathode of a Daniel cell?

EASY
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What is the E.M.F of a cell in terms of reduction potential of its left and right electrodes?