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Standard XII
Chemistry
Representation of Cell
Which of the ...
Question

Which of the following is true for an electrolytic cell?

A
An electric current causes an otherwise nonspontanteous 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 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 nonspontanteous chemical reaction to occur.
For electrolytic cell following are true statements:
(a) Nonspontaneous Reduction.
(b) electrical energy → chemical energy
(c) Oxidation at anode (+ve charged electrode)
Reduction at cathode (−ve charged electrode)

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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.
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


Q. Which of the following occurs in a Cu−Zn cell?
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