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Classification of Elements and Periodicity in Properties

JEE Main 2024 (Online) 1st February Morning ShiftMCQEasy📈 Topic in 19% papers+4−1
Ques. 1JEE Main 2024, 1 February (Morning Shift)

In case of isoelectronic species the size of F-, Ne and Na+ is affected by :

  1. Nuclear charge (Z)
  2. None of the factors because their size is the same
  3. Electron-electron interaction in the outer orbitals
  4. Principal quantum number (n)

Answer

(1) Nuclear charge (Z)

Solution

F-, Ne, Na+: each has 10 electrons, 1s2 2s2 2p6 (same n = 2, same electron–electron repulsion)

Only Z differs: F- (9) < Ne (10) < Na+ (11)

∵ larger Z pulls the same 10 electrons more strongly ⇒ size: F- > Na+

⇒ size depends on nuclear charge (Z); (B), (C), (D) are not the deciding factor

Answer: (1)

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Ques. 2JEE Main 2024, 1 February (Morning Shift)

Among the following oxides of p-block elements, number of oxides having amphoteric nature is . Cl2O7, CO, PbO2, N2O, NO, Al2O3, SiO2, N2O5, SnO2

Ques. 3JEE Main 2024, 1 February (Evening Shift)

Given below are two statements : In the light of the above statements, choose the most appropriate 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 false but Statement II is true
  4. Statement I is true but Statement II is false
Ques. 4JEE Main 2024, 31 January (Morning Shift)

The correct sequence of electron gain enthalpy of the elements listed below is Choose the most appropriate from the options given below:

  1. A > D > C > B
  2. A > D > B > C
  3. D > C > B > A
  4. C > B > D > A
Ques. 5JEE Main 2024, 31 January (Evening Shift)

Consider the following elements. [figure] Which of the following is/are true about A', B', C' and D' ? Choose the correct answer from the options given below :

  1. A only
  2. B, C and D only
  3. A and B only
  4. A, B and D only
Ques. 6JEE Main 2024, 30 January (Morning Shift)

If IUPAC name of an element is "Unununnium" then the element belongs to nth group of Periodic table. The value of n is .

Ques. 7JEE Main 2024, 30 January (Evening Shift)

Given below are two statements: In the light of the above statements, choose the most appropriate 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. Statement I is True But Statement II is False
  4. Both Statement I and Statement II are True
Ques. 8JEE Main 2024, 29 January (Morning Shift)

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R : In the light of the above statements, choose the most appropriate from the options given below :

  1. A is false but R is true
  2. Both A and R are true but R is NOT the correct explanation of A
  3. Both A and R are true and R is the correct explanation of A
  4. A is true but R is false
Ques. 9JEE Main 2024, 29 January (Evening Shift)

Given below are two statements: In the light of the above statements, choose the most appropriate 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 false but Statement II is true
  4. Statement I is true but Statement II is false
Ques. 10JEE Main 2024, 29 January (Evening Shift)

The element having the highest first ionization enthalpy is

  1. C
  2. Al
  3. Si
  4. N
Ques. 11JEE Main 2024, 27 January (Morning Shift)

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

  1. Statement I is false but Statement II is true
  2. Both Statement I and Statement II are true
  3. Statement I is true but Statement II is false
  4. Both Statement I and Statement II are false

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