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D and F Block Elements question

2005 · Shift 0 · Q42
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D and F Block Elements question

2005 · Shift 0 · Q42

JEE MainChemistryD and F Block ElementsMCQ+4 / −1
Which of the following factors may be regarded as the main cause of lanthanide contraction?
  1. A
    Poor shielding of one of 4f electron by another in the subshell
  2. B
    Effective shielding of one of 4f electrons by another in the subshell
  3. C
    Poorer shielding of 5d electrons by 4f electrons
  4. D
    Greater shielding of 5d electrons by 4f electrons
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