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p-Block Elements (Group 13 & 14)

JEE Main 2024 (Online) 5th April Morning ShiftMCQEasy📈 Topic in 32% papers+4−1
Ques. 1JEE Main 2024, 5 April (Morning Shift)

The number of neutrons present in the more abundant isotope of boron is 'x'. Amorphous boron upon heating with air forms a product, in which the oxidation state of boron is 'y'. The value of x + y is .

  1. 9
  2. 6
  3. 4
  4. 3

Answer

(1) 9

Solution

Boron: 10B ( 19\%) and 11B ( 81\%) ⇒ more abundant 115B

⇒ x = 11 - 5 = 6 neutrons

4B + 3O2 2B2O3 (with N2 of air: BN) ⇒ B is +3 in both ⇒ y = 3

∴ x + y = 6 + 3 = 9

Answer: (1)

Keep practising — p-Block Elements (Group 13 & 14)

Ques. 2JEE Main 2024, 5 April (Evening Shift)

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

  1. (A), (B), (C) and (E) only
  2. (C) and (E) only
  3. (A), (C) and (E) only
  4. (A) and (C) only
Ques. 3JEE Main 2024, 4 April (Evening Shift)

The correct order of the first ionization enthalpy is

  1. Ga > Al > B
  2. Tl > Ga > Al
  3. Al > Ga > Tl
  4. B > Al > Ga
Ques. 4JEE 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. Statement I is false but Statement II is true
  2. Both Statement I and Statement II are false
  3. Both Statement I and Statement II are true
  4. Statement I is true but Statement II is false
Ques. 5JEE Main 2024, 31 January (Morning Shift)

Consider the oxides of group 14 elements SiO2, GeO2, SnO2, PbO2, CO and GeO. The amphoteric oxides are

  1. SnO2, CO
  2. SiO2, GeO2
  3. SnO2, PbO2
  4. GeO, GeO2
Ques. 6JEE Main 2024, 31 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. Statement I is false but statement II is true
  2. Both statement I and statement II are true
  3. Both statement I and statement II are false
  4. Statement I is true but statement II is false
Ques. 7JEE Main 2024, 30 January (Morning Shift)

Aluminium chloride in acidified aqueous solution forms an ion having geometry

  1. Square planar
  2. Octahedral
  3. Trigonal bipyramidal
  4. Tetrahedral
Ques. 8JEE Main 2024, 29 January (Morning 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 true
  3. Both Statement I and Statement II are false
  4. Statement I is true but Statement II is false
Ques. 9JEE Main 2024, 27 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 answer from the options given below :

  1. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
  2. Both (A) and (R) are correct and (R) is the correct explanation of (A)
  3. (A) is true but (R) is false
  4. (A) is false but (R) is true

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