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Incorrect order of ionic size is:
  • a)
    La3+ > Gd3+ > Eu3+ > Lu3+
  • b)
    V2+ > V3+ > V4+ > V5+
  • c)
    Tl+ > In+ > Sn2+ > Sb3+
  • d)
    K+ > Sc3+ > V5+ > Mn7+
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Incorrect order of ionic size is:a)La3+ > Gd3+ > Eu3+ > Lu...
In a given lanthanide series , ionic radii decreases due to lanthanoid contraction . So size of Eu3+ should be larger than Gadolinium ion Gd3+
Hence option A is the answer.
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Community Answer
Incorrect order of ionic size is:a)La3+ > Gd3+ > Eu3+ > Lu...
B)La3+ > La > La2+

The correct order of ionic size is:

La2+ > La > La3+
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