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AIIMS 201827 May
Exam
AIIMS
Year
2018
Date
27 May
Subject
Chemistry
Chapter
d and f Block Elements

AIIMS 2018 · 27 May · Chemistry · d and f Block Elements

Least number of oxidation states is shown by

Least number of oxidation states is shown by

Options

  1. ANp\mathrm{Np} (Neptunium)
  2. BTh (Thorium)
  3. CU (Uranium)
  4. DRe (Rhenium).

Correct answer

B. Th (Thorium)

Step-by-step solution

Np⁡(+3,+4,+5,+6)\operatorname{Np}(+3,+4,+5,+6), Th (+3,+4)(+3,+4), U(+3,+4,+5,+6)\mathrm{U}(+3,+4,+5,+6) and Re⁡(+2,+4,+6,+7,−1)\operatorname{Re}(+2,+4,+6,+7,-1)
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