Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main20231 Feb 2023Evening ShiftChemistryp Block Elements (Group 13 & 14)Actual

The correct order of bond enthalpy ( kJ mol – 1 ) is:

Options

  1. ASi - Si > C - C > Sn - Sn > Ge - Ge
  2. BSi - Si > C - C > Ge - Ge > Sn - Sn
  3. CC - C > Si - Si > Sn - Sn > Ge - Ge
  4. DC - C > Si - Si > Ge - Ge > Sn - Sn

Correct answer

D. C - C > Si - Si > Ge - Ge > Sn - Sn

Step-by-step solution

As bond length increases, bond energy decreases. Bond Bond energy (kJ mol -1 ) C - C 348 Si - Si 297 Ge - Ge 260 Sn - Sn 240 So, bond enthalpy order C   -   C   >   Si   -   Si   >   Ge   -   Ge   >   Sn   -   Sn

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