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d- and f-Block Elements

AIPMT 2002MCQEasy📈 Topic in 25% papers+4−1
Ques. 1AIPMT 2002

Which of the following shows maximum number of oxidation states?

  1. Cr
  2. Fe
  3. Mn
  4. V

Answer

(3) Mn

Solution

As per NCERT, the number of oxidation states is maximum for elements in the middle of the 3d series.

V: +2 to +5 (4 states); Cr: +2 to +6 (5 states); Mn: +2 to +7 (6 states); Fe: +2, +3 (and +6, rarely)

Mn (3d5 4s2) can use all seven 3d + 4s electrons in bonding

Mn shows the maximum number of oxidation states (+2 to +7).

Answer: (3)

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Ques. 2AIPMT 2001

Which of the following statements is not correct?

  1. La(OH)3 is less basic than Lu(OH)3.
  2. In lanthanide series ionic radius of Ln3+ ion decreases.
  3. La is actually an element of transition series rather than lanthanides.
  4. Atomic radii of Zr and Hf are nearly the same because of lanthanide contraction.
Ques. 3AIPMT 2000

Which of the following shows maximum number of oxidation states?

  1. Cr
  2. Fe
  3. Mn
  4. V
Ques. 4AIPMT 2000

Which ion is colourless?

  1. Cr4+
  2. Sc3+
  3. Ti3+
  4. V3+

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