The d and f Block Elements MCQs With Answer 2 Pdf

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The d and f Block Elements MCQs With Answer Pdf Free Download 2021.

The d and f Block Elements MCQs With Answer Pdf Free Download 2021: Free PDF Download of CBSE Chemistry Multiple Choice Questions for Class 12 with Answers Chapter 8 The d and f Block Elements. Chemistry MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Chemistry The d-and f-Block Elements MCQs Pdf with Answers to know their preparation level.

The d and f Block Elements MCQs With Answer Pdf
The d and f Block Elements MCQs With Answer Pdf

The d and f Block Elements MCQs With Answer Pdf Free Download

Answer:

  1. Answer: d
    Explaination:
    (d) Ni2+, Ti3+ are coloured due to presence of unpaired electrons.
  2. Answer: b
    Explaination:
    (b) Cr3+
    ∵ t2g3+ (half filled p-orbitals) are more stable.
  3. Answer: d
    Explaination:
    (d) 2 MnO4 + 5SO32 + 16H+ → 2Mn2+ + 5SO42+ + 8H20
    5 moles of SO32- needs 2 moles of KMnO4
    1 mole of SO32- needs 2/5 moles of KMnO4
  4. Answer: d
    Explaination:
    (d) ∵ Cr+ (4s°3d5), Mn+ 4s13d5, V1(4s+3d3), Ti+4s13d2
  5. Answer: a
    Explaination:
    (a) Zr4+, Hf have similar size due to lanthanoid contraction.
  6. Answer: a
    Explaination: (a) It is due to formation of chromium sulphate.
  7. Answer: a
    Explaination:
    (a) Mn2+ (3d5) is most stable, Fe2+ (3d6), Cr2+(3d4 Co2+(3d1)
  8. b
  9. Answer: b
    Explaination:
    (b) Yb2+ (4f14) does not have unpaired election, therefore, diamagnetic.
  10. Answer: b
    Explaination:
    (b) 2MnO4 + 6H4 + 5H2O2 → 2Mn2+ + 8H2O + 5O2
  11. Answer: b
    Explaination:
    (b) Ni2+ has 2 unpaired electrons.
  12. Answer:
    Explaination:
    (a) It is due to L → M charge transfer transition by absorbing light from visible region and radiates purple colour.
  13. Answer: b
    Explaination:
    (b) 2KMnO4 + 16 HCl → 2KCl + 2MnCl2 + 5Cl2 + 2H2O
  14. Answer: d
    Explaination:
    (d) V2O3 and CrO are basic oxides due to lower, oxidation states.
  15. Answer: d
    Explaination:
    (d) Cr3+ is formed.
  16. a
  17. Answer: a
    Explaination:
    (a) Cu(II) is more stable due to higher hydration energy.
  18. Answer: d
    Explaination:
    (d) Cu has highest density due to greater atomic mass.
  19. Answer: b
    Explaination:
    (b) CUF2 is coloured due to presence ofunpaired electron in d-orbital.
  20. Answer: a
    Explaination:
    (a) It is due to formation of Mn2O7.
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  22. Answer: d
    Explaination:
    (d) Mn2+ acts as autocatalyst.
  23. d
  24. b
  25. c
  26. c
  27. d
  28. d
  29. d
  30. d
  31. d
  32. b
  33. Answer:
    Explaination:
    (b) and (c) higher oxidation states are more stable.
  34. Answer:
    Explaination:
    (b) and (d) Pu and Np show oxidation state upto +7.
  35. Explaination:
    (a) and (b) U and Np, U (5f36d17s2), Np (5f46d17S2)
  36. Explaination:
    (b) and (c) Eu2+ (4f7) and Yb2+ (4f14) are more stable.
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  41. Answer: a
    Explaination:
    (a) Both assertion and reason are true, and reason is the correct explanation of the assertion.
    Cu2+ 2I → 2Cu+ +I2
  42.  

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