CBSE  /  Class 11  /  Chemistry  /  Redox Reactions

  • 1. 
    Which of the following reactions does not involve either oxidation or reduction?

  • VO→ VO
  • Na → Na
  • CrO→ CrO
  • Zn→Zn

  • 2. 
    KMnO reacts with oxalic acid according to the equation 2MnO + 5CO + 16H+ → 2Mn +10CO+ 8H O Here 20 mL of 0.1 M KMnO is equivalent to

  • 50 mL of 0. 5 M CHO
  • 20 mL of 0. 1 M CHO
  • 20 mL of 0. 5 M CHO
  • 50 mL of 0. 1 M CHO

  • 3. 
    One mole of NH

  • -1
  • -3
  • +3
  • +5

  • 4. 
    What is n-factor?

  • Equal to product of Number of moles of electrons when Lost or gained by one mole of reductant or oxidant
  • When Number of moles of electrons Lost or gained by one mole of reductant or oxidant is not same.
  • Equal to Number of moles of electrons Lost or gained by one mole of reductant or oxidant
  • None of the above

  • 5. 
    The oxidation number of Mn is maximum in

  • MnO2
  • K2MnO4
  • Mn3O4
  • KMnO4.

  • 6. 
    The oxidation process involves

  • Increase in oxidation number
  • Decrease in oxidation number
  • No change in oxidation number
  • none of the above

  • 7. 
    Metals generally react with dilute acids to produce hydrogen gas. Which one of the following metals does not react with dilute hydrochloric acid?

  • Copper
  • Magnesium
  • Iron
  • Silver

  • 8. 
    The oxidation number of Xe in BaXeO is

  • 8
  • 6
  • 4
  • 10

  • 9. 
    The colourless solution of silver nitrate slowly turns blue on adding copper chips to it because of

  • Dissolution of Copper
  • Oxidation of Ag→ Ag
  • Reduction of Cu ions
  • Oxidation of Cu atoms.

  • 10. 
    A standard reduction electrode potentials of four metals are A = -0. 250 V, B = -0. 140 V, C = -0. 126 V, D = -0. 402 V The metal that displaces A from its aqueous solution is:

  • A
  • B
  • C
  • D
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