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Standard XII
Chemistry
Fuel Cells
Which of the ...
Question

Which of the following is true of an electrolytic cell?

A
An electric current causes an otherwise non-spontaneous chemical reaction to occur.
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B
Reduction occurs at the anode
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C
A spontaneous electrochemical reaction produces an electric current
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D
The electrode to which the electrons flow is where oxidation occurs
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E
None of the above
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Solution

The correct option is A An electric current causes an otherwise non-spontaneous chemical reaction to occur.
An electrolytic cell is a device which makes a non spontaneous reaction spontaneous by the use of electricity.

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Q. Assertion :Anode is the electrode at which oxidation occurs and cathode is the electrode at which reduction occurs. Reason: Anode and cathode in electrochemical cells and electrolytic cells have opposite polarity.
Q. Assertion :In an electrochemical cell, the electrode that is the site of reduction is called the anode.
Reason: Oxidation always occurs at the cathode.
Q. An electrolytic cell is one which can convert electrical energy into chemical energy in a non-spontaneous redox reaction.
Q.
Electrochemical Battery

An electrochemical battery is a device powered by oxidation and reduction reactions that are physically separated. So that the electrons must travel through a wire from the reducing agent to the oxidizing agent.

The reducing agent loses electrons and is oxidized in a reaction that takes place at an electrode is called the anode. The oxidizing agent gains electrons and is reduced in a reaction that takes at an electrode is called the cathode.

To maintain a net zero charge in each compartment, there is a limited flow of ions through a salt bridge.
For example, in a car battery the reducing agent is oxidized by the following reaction, which involves a lead ( Pb ) anode and sulfuric acid ( H2SO4). Lead sulfate ( PbSO4 ), protons ( H ), and electrons ( e−) are produced.

At the cathode, the below reaction occurs :

PbO2+H2SO4+2H++2e−→ PbSO_4+2H_2O$
At the anode, the below reaction occurs :

Pb+H2SO4→PbSO4+2H++2e−

Electrons are produced by a chemical reaction that takes place at the:

Q.

The following are some statements about electrolysis:

I) Involves flow of electrons from anode to cathode

II) Involves no chemical reaction at electrodes

III) Oxidation occurs at anode and reduction at cathode

IV) Anions migrate towards cathode


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