Quiz  /  Redox Reactions Class 11 MCQ Questions With Answers

  • 1. 
    Cl2 + 2e- --> 2Cl - is an example of:

  • a chemical reaction
  • redox
  • oxidation
  • reduction

  • 2. 
    Defined as the loss of electrons.

  • oxidation
  • reduction
  • redox
  • OIL RIG

  • 3. 
    Is calcium oxidized or reduced in the following reaction? 2CaO--> 2Ca + O2

  • Oxidized
  • Reduced

  • 4. 
    What element is being Reduced?

  • N
  • H
  • O
  • S

  • 5. 
    An increase in oxidation number.

  • more acidic
  • reduction
  • less basic
  • oxidation

  • 6. 
    In a voltaic cell electrons flow

  • through the salt bridge
  • from the cathode to the anode through the wire
  • from the anode to the cathode through the wire

  • 7. 
    What is the oxidation number of N in NO2-1?

  • -3
  • +4
  • -2
  • +3

  • 8. 
    What type of reaction is the following? Zn(s) + 2Cu(NO3)2(aq) ---> 2Cu(s) + Zn(NO3)2(aq)

  • double displacement
  • single displacement
  • precipitation
  • neutralization

  • 9. 
    (a) Zn2+(aq) + 2e- -> Zn(s) -0.76(b) Cr3+(aq) + 3e- -> Cr(s) -0.74 (c) Fe2+(aq) + 2e- -> Fe(s) -0.41correct decreasing order of reducing agents is

  • a>b>c
  • b>a>c
  • c>a>b
  • c>b>a

  • 10. 
    A compound having +2 oxidation state of O is

  • H2O
  • H2O2
  • OF2
  • O2F2

  • 11. 
    Which energy conversion shown below takes place in a voltaic cell?

  • Electrical to chemical
  • Mechanical to chemical
  • Mechanical to electrical
  • Chemical to electrical

  • 12. 
    What is oxidation number of H in CaH2?

  • +1
  • -1
  • 0
  • +2

  • 13. 
    II lines in the diagram represents

  • road signal
  • salt dissociation
  • interphase
  • salt bridge

  • 14. 
    2Pb(NO3)2 --> 2PbO + 4NO2 + O2

  • Synthesis
  • Decomposition
  • Single Displacement
  • Combustion

  • 15. 
    H2O2--> H2O +O2 is an example of

  • displacement reaction
  • combination reaction
  • decomposition reaction
  • disproportionation reaction

  • 16. 
    What are the coefficients when the equation is balanced?

  • 2 + 3 --> 2 + 3 + 4
  • 1 + 3 --> 1 + 3 + 2
  • 2 + 4 --> 2 + 3 + 2
  • 1 + 1 --> 1 + 1 + 1

  • 17. 
    What reaction occurs at the anode?

  • Ag+ + e- →Ag
  • Ag → Ag+ + e-
  • Ni2+ + 2e- → Ni
  • Ni → Ni2+ + 2e-

  • 18. 
    Name the following ionic compound: Cs2S

  • cesium sulfide
  • cesium sulfate
  • cesium (II) sulfate
  • cesium (II) sulfide

  • 19. 
    What is oxidation number of Cr in Cr2O72-?

  • -2
  • +2
  • +6
  • +12

  • 20. 
    What element is being Oxidized?

  • N
  • H
  • O
  • S

  • 21. 
    Which problem is balanced?

  • PbO2 + 2H2
  • SO2 + H20 --> H2SO4
  • 2Na + 2H2O --> 2NaOH + H2

  • 22. 
    What will be the result of the following: Br2 + NaF ->

  • bromine will replace Na
  • Na will replace Br
  • Br will replace F
  • no reaction will occur

  • 23. 
    What is oxidation number of H in H2O?

  • 0
  • -2
  • -1
  • +1
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