English

Define ‘Redox Reaction’. Give One Example. - Science

Advertisements
Advertisements

Questions

Define ‘redox reaction’. Give one example.

What is redox reaction? Explain with one example

Solution 1

When oxidation and reduction occur simultaneously in a given chemical reaction, it is known as a redox reaction.
Example of a redox reaction:

Reduction         Oxidation

BaSO4 +4C →  BaS+4CO

shaalaa.com

Solution 2

The reaction in which simultaneous oxidation and reduction take place is called a redox reaction

Cu+2 + Zn → Zn+2 + Cu

in the above reaction, copper undergoes reduction whereas Zn undergoes oxidation.
Therefore the reaction is redox reaction.

shaalaa.com

Solution 3

The reaction in which one substance gets oxidised and other gets reduced is known as redox reaction.

Example:

ZnO + C → Zn + CO

Here, C is oxidised to CO because oxygen is being added and ZnO is reduced to Zn because oxygen is being removed. Therefore, it is a redox reaction.

 

shaalaa.com
  Is there an error in this question or solution?
Chapter 1: Chemical Reactions and Equations - Exercise 2 [Page 46]

APPEARS IN

Lakhmir Singh Chemistry (Science) [English] Class 10
Chapter 1 Chemical Reactions and Equations
Exercise 2 | Q 26.1 | Page 46

RELATED QUESTIONS

Write the chemical formula of rust.


What is an oxidation reaction? Identify in the following reaction (i) the substance oxidised, and (ii) the substance reduced:

ZnO + C → Zn + CO


Identify the component oxidised in the following reaction:

H2S + Cl2 → S + 2HCl


Is oxidation an exothermic or an endothermic reaction?


In the context of redox reactions, the removal of hydrogen from a substance is known as:
(a) oxidation
(b) dehydration
(c) reduction
(d) dehydrogenation


In order to prevent the spoilage of potato chips, they are packed in plastic bags in an atmosphere of:
(a) Cl2
(b) H2
(c) N2
(d) O2


The process of respiration is:
(a)  an oxidation reaction which is endothermic
(b) a reduction reaction which is exothermic
(c) a combination reaction which is endothermic
(d) an oxidation reaction which is exothermic


Fill in the blank

In redox reaction oxidation and reduction occur ............................


Indicate which of the following statement is true and which is false:

The removal of hydrogen from a substance is called reduction.


Identify the substances that are oxidised and the substances that are reduced in the following reaction.

\[\ce{CuO(s) + H2(g) -> Cu(s) + H2O (l)}\]


 Explain the following in term Reduction of gain or loss of oxygen with two example.


Electrolysis is a redox process. Explain.


How would you change a metal like Cu into its ions?


Explain the following in term of gain or loss of oxygen with two examples.

Oxidation


Compare hydrogen with alkali metals on the basis of:

Oxide formation 


Is it essential that oxidation and reduction must occur side by side in a chemical reaction? Explain


State, giving reason, whether the substances printed in bold letters have been oxidized or reduced.

Mg + 2HCl → MgCl2 + H2


State whether the following conversion is oxidation or reduction:

Cu2+ + 2 e-→ Cu 


In the following reaction: A+ + B → A + B+. Write half-reactions for this reaction and name:

  1. oxidizing agent
  2. substance oxidized
  3. reducing agent 

Divide the following reactions into oxidation and reduction half-reaction:

Cl2 + 2Br- → Br2 + 2Cl-


Divide the above equation into oxidation and reduction half-reactions.


For the reaction PbO + H2→ Pb + H2O, which of the following statements is wrong?


Name: 

a liquid that is an oxidizing agent as well as a reducing agent.


Complete and balance the following equation:

CuO +__________→ Cu +___________


Distinguish between oxidation and reduction.

State the condition and give balanced equation for the conversion of coke to water gas.


Explain the term oxidation in term of addition and removal of oxygen/hydrogen with a suitable example. 


Explain the term redox reaction with an example involving the reaction of hydrogen sulphide with chlorine.


Select the correct answer from the symbol in the bracket.

The element, which like hydrogen is a strong reducing agent.


Identify the following reactions as oxidation or reduction

  1. Na → Na+ + e
  2. Fe3+ + 2 e- → Fe+

Oxidation is a process which involves ____________.


Select the oxidising agent for the following reaction:

\[\ce{H2S + I2 -> 2HI + S}\]


Identify the reducing agent in the following reactions

`2"H"_2 + "O"_2 -> 2"H"_2"O"`


Identify the oxidising agent (oxidant) in the following reactions 

`"Pb"_3"O"_4 + 8"HCl" -> 3"PbCl"_2 + "Cl"_2 + 4"H"_2"O"`


Identify the oxidising agent (oxidant) in the following reactions

`"V"_2"O"_5 + 5"Ca" -> 2"V" + 5"CaO"`


Identify the oxidising agent (oxidant) in the following reactions

`3"Fe" + 4"H"_2"O" -> "Fe"_3"O"_4 + 4"H"_2`


Which among the following are physical or chemical change?

Heating of an iron rod to red hot


The tarnishing of metals is due to the formation of ______.


The tarnishing of metals is an example of ______ reaction.


Define oxidation number.


Find the oxidation number of the element in the following compound.

A1 in AlCl3


Identify the type of chemical reaction given below:

\[\ce{2Mg + O2 -> 2MgO}\]


It is recommended to use air tight containers for storing oil for a long time.


In the redox reaction:

MnO2 + 4HCl → MnCl2 + 2H2O + Cl2


The metallic oxide which can be reduced by using common reducing agents is ______.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×