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d- and f-Block Elements · Question 77

AIPMT 2000MCQEasy📈 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 elements in the middle of the 3d series show the greatest number of oxidation states, manganese showing all states from +2 to +7.

Mn (3d5 4s2): +2, +3, +4, +5, +6, +7

Cr: +2 to +6; Fe: +2 to +6; V: +2 to +5

∴ Mn shows the maximum number of oxidation states.

Answer: (3)

AIPMT 2000

Keep practising — d- and f-Block Elements

2

Which ion is colourless?

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

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