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Classification of Elements and Periodicity in Properties

JEE Main 2025 (Online) 23rd January Morning ShiftMCQEasy📈 Topic in 5% papers+4−1
Ques. 1JEE Main 2025, 23 January (Morning Shift)

The element that does not belong to the same period of the remaining elements (modern periodic table) is:

  1. Platinum
  2. Osmium
  3. Iridium
  4. Palladium

Answer

(4) Palladium

Solution

Concept: period = highest principal quantum number n.

Pt [Xe] 4f14 5d9 6s1, Os [Xe] 4f14 5d6 6s2, Ir [Xe] 4f14 5d7 6s2 ⇒ n = 6 (6th period)

Pd [Kr] 4d10 ⇒ 5th period ⇒ odd one out.

Answer: (4)

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Ques. 2JEE Main 2025, 22 January (Morning Shift)

Match List-I with List-II.

  1. A-IV, B-I, C-II, D-III
  2. A-III, B-IV, C-II, D-I
  3. A-II, B-III, C-IV, D-I
  4. A-IV, B-I, C-III, D-II
Ques. 3JEE Main 2025, 22 January (Morning Shift)

Which of the following electronegativity order is incorrect?

  1. S<Cl<O<F
  2. Al<Si<C<N
  3. Al<Mg<B<N
  4. Mg<Be<B<N
Ques. 4JEE Main 2025, 22 January (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 false
  2. Both Statement I and Statement II are true
  3. Statement I is true but Statement II is false
  4. Statement I is false but Statement II is true

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