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d- and f-Block Elements

JEE Main 2026 (Online) 8th April Evening ShiftMCQEasy📈 Topic in 11% papers+4−1
Ques. 1JEE Main 2026, 8 April (Evening Shift)

Given below are two statements for catalytic properties of transition metals. In the light of the above statements, choose the correct answer from the options given below :

  1. Both Statement I and Statement II are correct
  2. Both Statement I and Statement II are incorrect
  3. Statement I is correct but Statement II is incorrect
  4. Statement I is incorrect but Statement II is correct

Answer

(2) Both Statement I and Statement II are incorrect

Solution

Statement I: As per NCERT, the catalytic activity of transition metals is due to their ability to use both 3d and 4s electrons to form bonds between reactant molecules and atoms of the catalyst surface (e.g. Ni in hydrogenation) — not 3d electrons only ⇒ Statement I is incorrect.

Statement II: These bonds increase the concentration of reactants at the catalyst surface and WEAKEN the bonds in the reacting molecules, lowering the activation energy — they do not strengthen them ⇒ Statement II is incorrect.

Answer: (2)

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Ques. 2JEE Main 2026, 6 April (Morning Shift)

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

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

The correct order of first ( iH1) and second ( iH2) ionisation enthalpy values of Cr and Mn are : Choose the correct answer from the options given below :

  1. A and B only
  2. B and C only
  3. A and D only
  4. C and D only
Ques. 4JEE Main 2026, 5 April (Morning Shift)

Which of the following is NOT a physical or chemical characteristics of interstitial compounds?

  1. They have high melting points, higher than those of pure metals.
  2. They are very soft and ionic in nature.
  3. They retain metallic conductivity.
  4. They are chemically inert and usually non-stoichiometric.
Ques. 5JEE Main 2026, 5 April (Evening Shift)

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 correct
  2. Both Statement I and Statement II are incorrect
  3. Statement I is correct but Statement II is incorrect
  4. Statement I is incorrect but Statement II is correct
Ques. 6JEE Main 2026, 4 April (Morning Shift)

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
Ques. 7JEE Main 2026, 4 April (Morning Shift)

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
Ques. 8JEE Main 2026, 4 April (Morning Shift)

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
Ques. 9JEE Main 2026, 4 April (Evening Shift)

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
Ques. 10JEE Main 2026, 4 April (Evening Shift)

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
Ques. 11JEE Main 2026, 2 April (Morning Shift)

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+

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