Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main20199 Apr 2019Morning ShiftChemistryp Block Elements (Group 13 & 14)Actual

C 60 , an allotrope of carbon contains

Options

  1. A12 hexagons and 20 pentagons.
  2. B16 hexagons and 16 pentagons.
  3. C18 hexagons and 14 pentagons.
  4. D20 hexagons and 12 pentagons.

Correct answer

D. 20 hexagons and 12 pentagons.

Step-by-step solution

Fullerene is an Isotope of carbon which consist 20 hexagonal and 12   pentagonal rings, it has s p 2 hybridization and forms a cage-like structure.

Practice p Block Elements (Group 13 & 14) on Quantrex Academy →

More from p Block Elements (Group 13 & 14)

Given below are two statements : Statement I: Aluminium upon reaction with NaOH forms [Al(OH)₆]³⁻ ion. Statement II: The geometry of ICl₄^- , ClO₃^- and IBr₂^- is square planar, py 2026Consider the following reactions Na ₂ ~B ₄ O ₇ 2 X + Y CuSO ₄+ Y Non-Luminous flame Z + SO ₃ 2 Z +2 X + Carbon Luminous flame 2 Q + Na ₂ ~B ₄ O ₇+ CO The oxidation states of Cu in 2026It is noticed that Pb ²⁺ is more stable than Pb ⁴⁺ but Sn ²⁺ is less stable than Sn ⁴⁺ . Observe the following reactions. PbO ₂+ Pb 2 PbO ; _ r G ^ (1) SnO ₂+ Sn 2 SnO ; _ r G ^ (2 2026The correct statements from the following are : A. Ionic radii of trivalent cations of group 13 elements decreases down the group. B. Electronegativity of group 13 elements decreas 2026Given below are two statements : Statement I : Elements ' X ' and ' Y ' are the most and least electronegative elements, respectively among N , As , Sb and P. The nature of the oxi 2026Consider the following reactions. PbCl ₂+ K ₂ CrO ₄ ~A +2 KCl (Hot solution) A + NaOH B + Na ₂ CrO ₄ PbSO ₄+4 CH ₃ COONH ₄ ( NH ₄ )₂ SO ₄+ X In the above reactions, A , B and X are 2026Given below are two statements : Statement I : The number of pairs among [ SiO ₂, CO ₂ ], [ SnO , SnO ₂ ], [ PbO , PbO ₂ ] and [ GeO , GeO ₂ ] , which contain oxides that are both 2026The 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 o 2025 Full p Block Elements (Group 13 & 14) list All JEE Main PYQs