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p-Block Elements (Group 13 & 14) · Question 5

JEE Main 2026 (Online) 24th January Evening ShiftMCQEasy📈 Topic in 19% papers+4−1
1

Choose the INCORRECT statement

  1. Carbon exhibits negative oxidation states along with +4 and +2.
  2. Carbon cannot exceed its covalency more than four.
  3. Among the isotopes of carbon, 13C is a radioactive isotope.
  4. CO2 is the most acidic oxide among the dioxides of group 14 elements.

Answer

(3) Among the isotopes of carbon, 13C is a radioactive isotope.

Solution

(1) Correct: carbon shows –4 (e.g. CH4) and other negative states, besides +4 and +2.

(2) Correct: carbon has no d orbitals, so its maximum covalency is four.

(3) Incorrect: 12C and 13C are stable; as per NCERT, 14C is the radioactive isotope (half-life 5770 years, used in radiocarbon dating).

(4) Correct: acidic character of the dioxides decreases down the group; CO2, SiO2, GeO2 are acidic, SnO2 and PbO2 amphoteric.

Answer: (3)

JEE Main 2026 (Online) 24th January Evening Shift

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

2

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

  1. B and D Only
  2. C and D Only
  3. A and D Only
  4. A and C Only
JEE Main 2026 (Online) 23rd January Morning Shift
3

It is noticed that Pb2+ is more stable than Pb4+ but Sn2+ is less stable than Sn4+. Observe the following reactions. PbO2 + Pb 2PbO; rG (1) SnO2 + Sn 2SnO; rG (2) Identify the correct set from the following

  1. rG (1) > 0; rG (2) < 0
  2. rG (1) < 0; rG (2) > 0
  3. rG (1) < 0; rG (2) < 0
  4. rG (1) > 0; rG (2) > 0
JEE Main 2026 (Online) 23rd January Evening Shift
4

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. Both Statement I and Statement II are true
  4. Statement I is true but Statement II is false
JEE Main 2026 (Online) 21st January Morning Shift
5

The group 14 elements A and B have the first ionisation enthalpy values of 708 and 715 kJ mol-1 respectively. The above values are lowest among their group members. The nature of their ions A2+ and B4+ respectively is

  1. both reducing
  2. oxidising and reducing
  3. both oxidising
  4. reducing and oxidising
JEE Main 2025 (Online) 7th April Morning Shift
6

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

  1. A, B, D and E only
  2. A, C and D only
  3. A, B, C and E
  4. B, D and E only
JEE Main 2025 (Online) 7th April Evening Shift
7

Given below are the pairs of group 13 elements showing their relation in terms of atomic radius. (B < Al), (Al < Ga), (Ga < In) and (In < Tl). Identify the elements present in the incorrect pair and in that pair find out the element (X) that has higher ionic radius (M3+) than the other one. The atomic number of the element (X) is

  1. 49
  2. 81
  3. 31
  4. 13
JEE Main 2025 (Online) 4th April Morning Shift
8

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 correct but Statement II is incorrect
  2. Both Statement I and Statement II are incorrect
  3. Statement I is incorrect but Statement II is correct
  4. Both Statement I and Statement II are correct
JEE Main 2025 (Online) 4th April Evening Shift
9

The elements of Group 13 with highest and lowest first ionisation enthalpies are respectively :

  1. B & Tl
  2. Tl & B
  3. B & In
  4. B & Ga
JEE Main 2025 (Online) 4th April Evening Shift
10

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

  1. B and D Only
  2. A and B Only
  3. C and D Only
  4. A and C Only
JEE Main 2025 (Online) 3rd April Evening Shift
11

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 correct but Statement II is incorrect
  2. Both Statement I and Statement II are correct
  3. Statement I is incorrect but Statement II is correct
  4. Both Statement I and Statement II are incorrect
JEE Main 2025 (Online) 2nd April Morning Shift

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All JEE Main Chemistry chapters
Physical ChemistrySome Basic Concepts of ChemistryStructure of AtomStates of MatterThermodynamicsEquilibriumRedox ReactionsSolutionsElectrochemistryChemical Kinetics
Inorganic ChemistryClassification of Elements and Periodicity in PropertiesChemical Bonding and Molecular Structurep-Block Elements (Group 13 & 14)p-Block Elements (Group 15–18)d- and f-Block ElementsCoordination Compounds
Organic ChemistryOrganic Chemistry – Some Basic Principles and TechniquesIsomerismHydrocarbonsHaloalkanes and HaloarenesAlcohols, Phenols and EthersAldehydes, Ketones and Carboxylic AcidsAminesBiomoleculesPrinciples Related to Practical Chemistry