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:

anode.

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cathode.

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lead oxide electrode.

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oxidizer.

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salt bridge.

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Solution

The correct option is C anode.
At the anode, oxidation of metal takes place;
oxidation is the process of removal of the electron;

So, the electrons that are produced in the chemical reaction take place at the anode.

Hence, option (A) is correct

Suggest Corrections

Similar questions

(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.

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. a) The substance which loses electrons is called reducing agent.
b) The substance which gains electrons is called oxidizing agent.
Find out which is true or false statement.

Hydrogen peroxide in its reaction with $K I O_{4}$ and $N H_{2} O H$ respectively, is acting as:

Q. The electrode reactions for charging of a lead battery are:

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

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

The electrolyte in the battery is an aqueous solution of

H_{2} 3 O_{4}

. After this battery has been charged:

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The correct option is C anode.At the anode, oxidation of metal takes place;oxidation is the process of removal of the electron;So, the electrons that are produced in the chemical reaction take place at the anode.Hence, option (A) is correct

The correct option is C anode.
At the anode, oxidation of metal takes place;
oxidation is the process of removal of the electron;

So, the electrons that are produced in the chemical reaction take place at the anode.

Hence, option (A) is correct