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NEET 2012
Exam
NEET
Year
2012
Subject
Chemistry
Chapter
d and f Block Elements

NEET 2012 · Chemistry · d and f Block Elements

Which of the following exhibits only +3 oxidation state?

Which of the following exhibits only +3 oxidation state?

Options

  1. AUU
  2. BTh\mathrm{Th}
  3. CAc
  4. DPa\mathrm{Pa}

Correct answer

C. Ac

Step-by-step solution

89Ac=[Rn]6d1,7s2{ }_{89} \mathrm{Ac}=[\mathrm{Rn}] 6 d^1, 7 s^2 Oxidation state =+3=+3 90Th=[Rn]6d2,7s2{ }_{90} \mathrm{Th}=[\mathrm{Rn}] 6 d^2, 7 s^2 Oxidation states =+3,+4=+3,+4 91 Pa=[Rn]6d3,7s2{ }_{91} \mathrm{~Pa}=[\mathrm{Rn}] 6 d^3, 7 s^2 Oxidation states =+3,+4,+5=+3,+4,+5 92U=[Rn]6d4,7s2{ }_{92} \mathrm{U}=[\mathrm{Rn}] 6 d^4, 7 s^2 Oxidation states =+3,+4,+5,+6=+3,+4,+5,+6
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