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d- and f-Block Elements · Question 75

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

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)

AIPMT 2002

Keep practising — d- and f-Block Elements

2

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.
AIPMT 2001
3

Which of the following shows maximum number of oxidation states?

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

Which ion is colourless?

  1. Cr4+
  2. Sc3+
  3. Ti3+
  4. V3+
AIPMT 2000

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