Quiz  /  Redox Reactions Class 10 MCQ Questions With Answers

  • 1. 
    Which compound has manganese with oxidation number +6?

  • K2MnO4K_2MnO_4K2​MnO4​
  • KMnO4KMnO_4KMnO4​
  • MnO2 MnO_{2\ }MnO2 ​
  • MnCl2 MnCl_{2\ }MnCl2 ​

  • 2. 
    The statements which contain correct definitions of reduction

  • the removal of oxygen
  • the decrease in oxidation state/p>
  • the removal of electrons
  • Both A & B

  • 3. 
    What is the oxidation number of Cr in Cr2O72- ?

  • +14
  • +6
  • -6
  • -14

  • 4. 
    When a gas changes iron (III) oxide to iron (II) oxide, it shows that the gas is

  • a reducing agent
  • an oxidizing agent
  • a combustible gas
  • a diffusible gas

  • 5. 
    State the reducing agent in this reaction.Cu + 4HNO3 -> Cu(NO3)2 + 2H2O + 2NO2

  • Cu
  • HNO3
  • Cu(NO3)2
  • NO2

  • 6. 
    Which one of the following conversions is an example of reduction?

  • Copper (II) oxide to copper (II) sulfate
  • Copper (II) oxide to copper
  • Hydrochloric acid to chlorine
  • Lead (II) nitrate to lead (II) chloride

  • 7. 
    In the reaction, Fe2O3(s) + 3CO(g) → 2Fe(l) + 3CO2(g)

  • carbon monoxide is reduced
  • carbon monoxide is the oxidising agent
  • iron(III) oxide is oxidised
  • iron(III) oxide is the oxidising agent

  • 8. 
    Choose the RIGHT statement

  • in a redox reaction, there must be addition or removal of oxygen
  • the nature of redox reaction is the increase of element's oxidation number
  • if the oxidation number of an element changes, it is a redox reaction
  • an oxidising agent is oxidised in a redox reaction

  • 9. 
    Name the oxidising agent in the following reaction:nitrogen + hydrogen -> ammonia

  • nitrogen
  • hydrogen
  • ammonia

  • 10. 
    _____________ synthesis and decomposition reactions involve the transfer of electrons.

  • All
  • Most
  • No
  • Some

  • 11. 
    What is the reducing agent here: N2 + 3H2 --> 2NH3

  • N2
  • H2
  • NH3
  • 2NH3

  • 12. 
    The statements which are correct for an oxidising agent.

  • removes hydrogen
  • is reduced at the end of the reaction
  • accepts electrons
  • All Of above

  • 13. 
    Cl2 + 2e- --> 2Cl - is an example of:

  • a chemical reaction
  • redox
  • oxidation
  • reduction

  • 14. 
    The correct description about redox reaction is

  • Oxygen is definitely present
  • The oxidising agent itself carries out oxidation
  • Oxidation takes place before reduction
  • Electron transfer definitely takes place

  • 15. 
    An element in a compound turns into an element in a chemical reaction. The element ...

  • is definitely oxidised
  • is definitely reduced
  • may have been oxidisied or reduced
  • is neither oxidised nor reduced

  • 16. 
    Defined as the loss of electrons.

  • oxidation
  • reduction
  • redox
  • OIL RIG

  • 17. 
    The ionic equation shows the reaction between zinc (Zn) and hydrochloric acid.Zn + 2H+ -> Zn2+ + H2What change takes place in the zinc?

  • It gains electrons
  • Its oxidation state increases
  • It is reduced
  • It gains hydrogen

  • 18. 
    Substance that reduces another substance by losing electrons.

  • reducing agent
  • half-reaction
  • electronegative atom
  • oxidizing agent

  • 19. 
    Bordo mix that is used in agriculture cannot be held in an iron container because iron reacts with the copper (II) sulphate. In the reaction, iron

  • is an oxidising agent
  • is a reducing agent
  • has a decrease in oxidation number
  • is reduced

  • 20. 
    What is a half-reaction of this equation, Na + Cl --> NaCl ?

  • Cl + e- --> Cl-
  • Cl - e- --> Cl-
  • Na --> Na + e-
  • Na° + Cl°--> Na+1Cl-1

  • 21. 
    Is calcium oxidized or reduced in the following reaction? 2CaO--> 2Ca + O2

  • Oxidized
  • Reduced

  • 22. 
    What is the oxidation number of C in SrCO3?

  • -4
  • +2
  • -6
  • +4

  • 23. 
    Which particles DOES NOT have reducing power?

  • chloride ion
  • hydrogen ion
  • chlorine water
  • hydrogen gas

  • 24. 
    Which one below is BOTH oxidising agent and reducing agent?

  • NaNaNa
  • SO2 SO_{2\ }SO2 ​
  • Cl2 Cl_{2\ }Cl2 ​
  • CO2 CO_{2\ }CO2 ​

  • 25. 
    If in a reaction, copper is reduced; its number of electrons has:

  • Increased
  • Decreased
  • Remained Constant
  • Varies Randomly
Report Question
warning
access_time
  Time