Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →
Sign in

D and F Block Elements question

2019 · 9 Apr · Shift 2 · Q3
Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.
  1. PYQ Library
  2. /JEE Main
  3. /Chemistry
  4. /D and F Block Elements
  5. /2019 · 9 Apr · Shift 2 · Q3

D and F Block Elements question

2019 · 9 Apr · Shift 2 · Q3

JEE MainChemistryD and F Block ElementsMCQ+4 / −1
The maximum number of possible oxidation states of actinoides are shown by :
  1. A
    nobelium (No) and lawrencium (Lr)
  2. B
    actinium (Ac) and thorium (Th)
  3. C
    neptunium (Np) and plutonium (Pu)
  4. D
    berkelium (Bk) and californium (Cf)
View written solutionFree

Correct answer: C

  1. Key idea: In actinoids, many oxidation states are possible because the energies of the 5f5f5f, 6d6d6d, and 7s7s7s orbitals are quite close.

  2. We need the pair of elements that show the maximum number of oxidation states.

  3. Recall the common trend in actinoids:

    • Early actinoids show a larger variety of oxidation states.
    • The highest variability is seen around neptunium and plutonium.

  4. Typical oxidation states:

    • Ac, Th: limited oxidation states, mainly +3+3+3 and +4+4+4 respectively.
    • No, Lr: mostly stable in +2/+3+2/+3+2/+3 or +3+3+3 states; not many variable oxidation states.
    • Bk, Cf: mostly +3+3+3, with a few others like +4+4+4 possible in some cases, but still limited.
    • Np, Pu: show a wide range such as +3,+4,+5,+6,+3, +4, +5, +6,+3,+4,+5,+6, and +7+7+7.

  5. Therefore, the actinoids with the maximum number of possible oxidation states are: Np and Pu\boxed{\text{Np and Pu}}Np and Pu​

  6. Hence, the correct option is C.

PreviousNext

More from D and F Block Elements

  • The transition element that has lowest enthalpy of atomisation, is :2019 · MCQ
  • Consider the hydrated ions of Ti2+, V2+, Ti3+, and Sc3+. The correct order of their spin-only magnetic moments is :2019 · MCQ
  • The correct order of the first ionization enthalpies is :2019 · MCQ
  • The INCORRECT statement is :2019 · MCQ
  • The highest possible oxidation states of uranium and plutonium, respectively are :2019 · MCQ
  • The effect of lanthanoid contraction in the lanthanoid series of elements by and large means :2019 · MCQ
  • Wilkinson catalyst is : (Et = C2​H5​)2019 · MCQ
  • The 71st electron of an element X with an atomic number of 71 enters into the orbital :2019 · MCQ