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Classification of Elements and Periodicity in Properties

JEE Main 2025 (Online) 28th January Morning ShiftMCQEasy📈 Topic in 18% papers+4−1
Ques. 1JEE Main 2025, 28 January (Morning Shift)

The incorrect decreasing order of atomic radii is

  1. Si > P > Cl > F
  2. Mg > Al > C > O
  3. Al > B > N > F
  4. Be > Mg > Al > Si

Answer

(4) Be > Mg > Al > Si

Solution

Atomic radius decreases from left to right across a period (nuclear charge increases, electrons enter the same shell) and increases down a group (a new shell is added).

(1) Si, P, Cl are in period 3 (left to right) and F is in period 2 Si > P > Cl > F: correct.

(2) Mg, Al are in period 3; C, O are in period 2 Mg > Al > C > O: correct.

(3) Al is below B in group 13; B, N, F are in period 2 (left to right) Al > B > N > F: correct.

(4) Be (period 2) lies above Mg (period 3) in group 2, so Be is smaller than Mg (Be 111 pm, Mg 160 pm).

Be > Mg > Al > Si is incorrect.

Answer: (4)

Keep practising — Classification of Elements and Periodicity in Properties

Ques. 2JEE Main 2025, 28 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. Statement I is false but Statement II is true
  3. Statement I is true but Statement II is false
  4. Both Statement I and Statement II are true
Ques. 3JEE Main 2025, 24 January (Morning Shift)

Which of the following statements are NOT true about the periodic table? Choose the correct answer from the options given below:

  1. A, C and E Only
  2. A and E Only
  3. B, C and E Only
  4. D and E Only
Ques. 4JEE Main 2025, 24 January (Evening Shift)

The successive 5 ionisation energies of an element are 800, 2427, 3658, 25024 and 32824 kJ/mol, respectively. By using the above values predict the group in which the above element is present :

  1. Group 4
  2. Group 2
  3. Group 13
  4. Group 14
Ques. 5JEE 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
Ques. 6JEE 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. 7JEE 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. 8JEE 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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