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Classification of Elements and Periodicity in Properties

JEE Main 2026 (Online) 5th April Evening ShiftMCQMedium📈 Topic in 8% papers+4−1
Ques. 1JEE 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 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

Answer

(1) Both Statement I and Statement II are true

Solution

Statement I:

[Al2O3, Cr2O3] are both amphoteric, so they are of the same nature.

[Cl2O7, Mn2O7] are both acidic (Cl and Mn in +7, the highest oxidation state), so they are of the same nature.

[Na2O, V2O3]: Na2O is basic and, as per NCERT, V2O3 (V in +3) is basic, so they are of the same nature.

[CO, N2O] are both neutral, so they are of the same nature.

Thus all 4 pairs contain oxides of the same nature, and Statement I is true.

Statement II:

Na2O is basic, Al2O3 amphoteric, CO neutral and Cl2O7 acidic, so the most basic is Na2O (oxide of the most electropositive element) and the most acidic is Cl2O7; hence Statement II is true.

Answer: (1)

Keep practising — Classification of Elements and Periodicity in Properties

Ques. 2JEE Main 2026, 4 April (Morning Shift)

A monoatomic anion (A-) has 45 neutrons and 36 electrons. Atomic mass, group in the periodic table and physical state at room temperature of the element (A) respectively are

  1. 80, 17, liquid
  2. 81, 16, solid
  3. 80, 16, gas
  4. 81, 15, gas
Ques. 3JEE Main 2026, 4 April (Evening Shift)

The 1st ionization enthalpy for Mg is +737 kJ/mol. The most probable estimated value of the 2nd ionization enthalpy of Mg is .

  1. −906 kJ/mol
  2. −856 kJ/mol
  3. +1450 kJ/mol
  4. +590 kJ/mol
Ques. 4JEE Main 2026, 2 April (Morning 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 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
Ques. 5JEE Main 2026, 2 April (Evening Shift)

The correct set that contains all kinds (basic, acidic, amphoteric and neutral) of oxides is :

  1. Na2O, K2O, Al2O3 and As2O3
  2. Al2O3, As2O3, CO and NO
  3. K2O, Cl2O7, As2O3 and NO
  4. Na2O, N2O, Al2O3 and CO
Ques. 6JEE Main 2026, 2 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 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
Ques. 7JEE Main 2026, 28 January (Morning Shift)

In period 4 of the periodic table, the elements with highest and lowest atomic radii are respectively.

  1. Rb & Br
  2. Na & Cl
  3. K & Br
  4. K & Se
Ques. 8JEE Main 2026, 28 January (Evening Shift)

Consider the elements N, P, O, S, Cl and F. The number of valence electrons present in the elements with most and least metallic character from the above list is respectively.

  1. 7 and 5
  2. 6 and 7
  3. 5 and 7
  4. 5 and 6
Ques. 9JEE Main 2026, 24 January (Morning 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. 10JEE Main 2026, 24 January (Evening Shift)

The correct order of C, N, O and F in terms of second ionisation potential is

  1. C < N < F < O
  2. C < F < N < O
  3. F < N < C < O
  4. C < O < N < F
Ques. 11JEE Main 2026, 23 January (Morning Shift)

The correct trend in the first ionization enthalpies of the elements in the 3rd period of periodic table is :

  1. Si < S < Al < P < Cl
  2. Al < Si < S < P < Cl
  3. S < Si < Al < P < Cl
  4. Al < S < P < Si < Cl

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