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d- and f-Block Elements · Question 2

JEE Advanced 2025 Paper 1Multiple CorrectMedium📈 Topic in 17% papers+4−1
1

The pair(s) of diamagnetic ions is(are)

  1. La3+, Ce4+
  2. Yb2+, Lu3+
  3. La2+, Ce3+
  4. Yb3+, Lu2+

Answer

(1) La3+, Ce4+, (2) Yb2+, Lu3+

Solution

An ion is diamagnetic when it has no unpaired electrons (4f0 or 4f14 with no 5d electron).

La3+ [Xe] 4f0 and Ce4+ [Xe] 4f0 are both diamagnetic.

Yb2+ 4f14 and Lu3+ 4f14 are both diamagnetic.

La2+ (5d1) and Ce3+ (4f1) are paramagnetic. Yb3+ ( 4f13) and Lu2+ ( 4f145d1) are paramagnetic.

Answer: (A), (B)

JEE Advanced 2025 Paper 1

Keep practising — d- and f-Block Elements

2

The number of moles of potassium iodide required to produce two moles of P is .

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3

The number of zinc ions present in the molecular formula of Q is .

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