Define ‘Redox Reaction’. Give One Example. - Science and Technology 1

Advertisements
Advertisements

Define ‘redox reaction’. Give one example.

What is redox reaction? Explain with one example

Advertisements

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

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.

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.

 

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

APPEARS IN

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

RELATED QUESTIONS

Corrosion can be prevented by using ……………. solution.


The chemical formula for rust is.............. .


Define corrosion.


What is meant by rust?


Write the chemical formula of rust.


Identify the component oxidised in the following reaction:

H2S + Cl2 → S + 2HCl


Fill in the following blanks with suitable words:

The addition of hydrogen to a substance is called ........ whereas removal of hydrogen is called .......


Fill in the blank

 Oxidation is the removal of ......................and addition of ....................


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

The removal of hydrogen from a substance is called reduction.


Name the following:

The process in which oxygen is added or hydrogen is removed.


Define oxidation.


MULTIPLE CHOICE QUESTIONS

The process of adding oxygen to a substance is called

  1. oxidation.
  2. reduction.
  3. displacement.
  4. hydrogenation.

TRUE \ FALSE

Hydrogen is a good oxidizing agent.


Give scientific reason.

It is reccommended to use air tight container for storing oil for long time.


Identify from the reaction the reactants that undergo oxidation and reduction.
Fe + S → FeS


Identify from the following reaction the reactants that undergo oxidation and reduction.

2Ag2O → 4 Ag + O2 ↑


Identify from the reaction the reactants that undergo oxidation and reduction.

2Mg + O2 → 2MgO


Identify from the reaction the reactants that undergo oxidation and reduction.

\[\ce{NiO + H2 -> Ni + H2O}\]


Give the general group study of hydrogen with reference to

burning


Give the general group study of hydrogen with reference to

reducing power 


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

PbO + CO → Pb + CO2


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

H2+ Cl2→ 2HCl + S


State whether the following conversion is oxidation or reduction:

PbO2 + SO2→ PbSO4 


State whether the following conversion is oxidation or reduction:

2Cl- - e-→ Cl2 


A metal oxide that is reduced by hydrogen is


Name: 

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


 Complete and balance the following equation:

H2 + S → ___________


Complete and balance the following equation:

\[\ce{K + H2O -> }\]________+ ________


Complete and balance the following equation:

Fe + H2O →___________+____________


Distinguish between oxidation and reduction.

Define Oxidation reaction.


With reference to oxidation & reduction reaction – complete the statement given by filling in the blanks with only the words (a) Addition (b) Removal.

‘Oxidation is a chemical reaction involving ____ of oxygen to a substance or ____ of hydrogen from a substance. Reduction on the otherhand involves ____ of hydrogen to a substance or ____ of oxygen from a substance.


State what is oxidising agent. Give an example of oxidising agent in the gaseous, liquid, and solid form.


Give two test for an oxidising agent.


When the positive charge on an ion increases or the negative charge on them decreases it is called as _______.


Write chemical formula for rust.


Explain the following reaction with their balanced chemical equation.

Hydrogen sulphide reacts with sulphur dioxide.


Balance the given chemical reaction as per the instructions below.

\[\ce{NaOH + H2SO4 -> Na2SO4 + H2O}\]

Oxidation means losing electrons then what is reduction?


Oxidising agents are also called as ______ because they remove electrons form other substances.


Identify the following reactions as oxidation or reduction

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

Which of the following statements about the given reaction are correct?

\[\ce{3Fe_{(s)} + 4H2O_{(g)} -> Fe3O4_{(s)} + 4H2_{(g)}}\]

(i) Iron metal is getting oxidised.

(ii) Water is getting reduced.

(iii) Water is acting as the reducing agent.

(iv) Water is acting as oxidising agent.


Oxidation is a process which involves ____________.


When Ag is exposed to air it gets a black coating of ____________.


Identify the reducing agent in the following reactions - 

`"H"_2"O" + "F"_2 -> "HF" + "HOF"`


Identify the reducing agent in the following reactions

`"Fe"_2"O"_3 + 3"CO" -> 2"Fe" + 3"CO"_2`


Identify the oxidising agent (oxidant) in the following reactions

`2"Mg" + "O"_2 -> 2"MgO"`


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?

Sublimation of solid ammonium chloride


Mention some oxidation reactions that occur in daily life.


The tarnishing of metals is an example of ______ reaction.


Choose the odd one out and write the reason:


Identify the following reactions as oxidation/reduction/redox reaction

Zn + CuSO4 → Cu + ZnSO4


Identify the following reactions as oxidation/reduction/redox reaction

2Mg +O2 → 2MgO


What are redox reactions? Give examples.


Define oxidation number.


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

Zn in ZnSO4


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

Mg in MgO


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

N in NH3


Identify the type of chemical reaction given below:

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


When hydrogen gas is passed over black copper oxide, a reddish-coloured layer of copper is formed.

Answer the questions that follow based on this reaction.

  1. Write the equation.
  2. What type of reaction is it?
  3. Complete the blanks:
    In this reaction, an oxygen atom goes away from CuO (copper oxide), which means that ______ of copper oxide takes place, whereas a hydrogen molecule takes up an oxygen atom and water (H2O) is formed, meaning ______ of hydrogen takes place.

Answer the questions based on the equation below:

\[\ce{CH3 - CH2 - OH ->[{[O]}][K2Cr2O7/H2SO4] CH3 - COOH}\]

  1. What type of reaction is it?
  2. What is the role of the chemical written on the arrow?
  3. Give one example of one such type of chemical as in answer (b).

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


Metals are good ______.


The oxidizing agent in the equation \[\ce{S + 2H2SO4 -> 3SO2 + 2H2O}\] is ______.


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


Share
Notifications



      Forgot password?
Use app×