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Standard VIII

Physics

Electrolytic Cell

In an electro...

Question

In an electrolytic cell, the electrode at which the electrons enter the solution is called the . The chemical change that occurs at this electrode is called as _.

anode, oxidation

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anode, reduction

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cathode, oxidation

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cathode, reduction

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Solution

The correct option is D cathode, reduction
When an electric current is passed throughan electrolyte, the positive charged ion migrate towards cathode. At cathode it gets discharged by accepting an electron. An electrolytic cell is a electrochemical cell that undergoes a redox reaction(oxidation and reduction) when electrical energy is applied. An electrolytic cell has three components: an electrolyte and two electrodes (anode and cathode). When external current is applied to the electrodes, the ions in the electrolytes are attracted to an electrode with opposite charge. The positive charged ions migrate towards cathode, at cathode it gets discharged by accepting an electron and this process is known as reduction.

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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 (

P b

) anode and sulfuric acid (

H_{2} S O_{4}

). Lead sulfate (

P b S O_{4}

), protons (

H

), and electrons (

e^{-}

) are produced.

At the cathode, the below reaction occurs :

P b O_{2} + H_{2} S O_{4} + 2 H^{+} + 2 e^{-} \to

PbSO_4+2H_2O$

At the anode, the below reaction occurs :

P b + H_{2} S O_{4} \to P b S O_{4} + 2 H^{+} + 2 e^{-}

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

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.

(a) Here is an electrode reaction :

$C u \to C u^{2 +} + 2 e^{-}$ . At which electrode (anode or cathode) would such a reaction take place? Is this an example of oxidation or reduction ?

(b) A solution contains magnesium ions $(M g^{2 +})$ , iron (II) ions $F e^{2 +}$ and copper ions $C u^{2 +}$ . On passing an electric current through this solution, which ions will be the first to be discharged at the cathode? Write the equation for the cathode reaction.

(d) During the electrolysis of molten lead bromide, which of the following takes place ?

A. Bromine is released at the cathode,

B. Lead is deposited at the anode,

C. Bromine ions gain electrons,

D. Lead is deposited at the cathode.

Q. Assertion :A standard hydrogen electrode is also called reversible electrode. Reason: Standard hydrogen electrode can act both as anode as well as cathode in an electrochemical cell.

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In an electrolytic cell, the electrode at which the electrons enter the solution is called the ________. The chemical change that occurs at this electrode is called as _________.

In an electrolytic cell, the electrode at which the electrons enter the solution is called the . The chemical change that occurs at this electrode is called as _.