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d- and f-Block Elements · Question 7

JEE Main 2026 (Online) 4th April Morning ShiftMCQMedium📈 Topic in 3% papers+4−1
1

The correct statements among the following are, Choose the correct answer from the options given below :

  1. A and B Only
  2. C and D Only
  3. B and D Only
  4. A and C Only

Answer

(3) B and D Only

Solution

A. Down a group of the d-block the higher oxidation states become more stable; as per NCERT, Mo(VI) and W(VI) are more stable than Cr(VI) ( Cr2O72- is a strong oxidant, MoO3, WO3 are not) ⇒ A is incorrect.

B. Ce4+ and Tb4+ tend to return to the common +3 state ⇒ oxidants; Eu2+ and Yb2+ also go to +3 ⇒ reductants ⇒ B is correct.

C. Am: [Rn]5f7 7s2 ⇒ 7 unpaired electrons; Cm: [Rn]5f7 6d1 7s2 ⇒ 8 unpaired electrons ⇒ C is incorrect.

D. Because 5f electrons shield very poorly, the actinoid contraction from element to element is greater than the lanthanoid contraction ⇒ D is correct.

∴ B and D only

Answer: (3)

JEE Main 2026 (Online) 4th April Morning Shift

Keep practising — d- and f-Block Elements

2

Correct statements from the following are Choose the correct answer from the options given below :

  1. A, B and C Only
  2. A, C and D Only
  3. A and C Only
  4. B and D Only
JEE Main 2026 (Online) 4th April Morning Shift
3

Match the LIST-I with LIST-II Choose the correct answer from the options given below :

  1. A-I, B-III, C-IV, D-II
  2. A-II, B-I, C-III, D-IV
  3. A-IV, B-II, C-I, D-III
  4. A-III, B-I, C-IV, D-II
JEE Main 2026 (Online) 4th April Morning Shift
4

Pairs of elements with the same number of electrons in their respective 4f orbital are [Atomic number. Eu-63, Gd-64, Dy-66, Ho-67, Tm-69, Yb-70, Lu-71, Hf-72] Choose the correct answer from the options given below :

  1. B and C Only
  2. A and B Only
  3. A and D Only
  4. A and C Only
JEE Main 2026 (Online) 4th April Evening Shift
5

Consider |x| is the difference in oxidation states of Mn in highest manganese fluoride and highest manganese oxide. The ions with |x| number of unpaired electrons from the following are : Choose the correct answer from the options given below :

  1. A and B Only
  2. C, D and E Only
  3. C and E Only
  4. B and E Only
JEE Main 2026 (Online) 4th April Evening Shift
6

Which of the following sets includes all the species that will change the orange colour of K2Cr2O7 in acidic medium ?

  1. Fe2+, Sn2+, I-, S2-
  2. S2-, Fe3+, I-, C2O42-
  3. Fe2+, NO2-, SO2, Sn4+
  4. Fe3+, SO42-, S2-, Sn4+
JEE Main 2026 (Online) 2nd April Morning Shift
7

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below :

  1. Both Statement I and Statement II are true
  2. Both Statement I and Statement II are false
  3. Statement I is true but Statement II is false
  4. Statement I is false but Statement II is true
JEE Main 2026 (Online) 2nd April Evening Shift
8

Among Fe2+, Fe3+, Cr2+ and Zn2+, the ion that shows positive borax bead test and with highest ionisation enthalpy is :

  1. Fe2+
  2. Zn2+
  3. Cr2+
  4. Fe3+
JEE Main 2026 (Online) 2nd April Evening Shift
9

Number of paramagnetic ions among the following d- and f-block metal ions is . Mn2+, Cu2+, Zn2+, Yb2+, Sc3+, La3+, Gd3+, Lu3+, Ti4+, Ce4+ (Atomic number of Mn = 25, Cu = 29, Zn = 30, Yb = 70, Sc = 21, La = 57, Gd = 64, Lu = 71, Ti = 22, Ce = 58)

JEE Main 2026 (Online) 2nd April Evening Shift
10

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below

  1. Statement I is false but Statement II is true
  2. Both Statement I and Statement II are false
  3. Both Statement I and Statement II are true
  4. Statement I is true but Statement II is false
JEE Main 2026 (Online) 28th January Morning Shift
11

Consider the following statements about manganate and permanganate ions. Identify the correct statements. Choose the correct answer from the options given below :

  1. A and D Only
  2. A, B and C Only
  3. A, C and D Only
  4. A, D and E Only
JEE Main 2026 (Online) 28th January Evening Shift

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