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JEE Main 202330 JanuaryEvening Shift
Exam
JEE Main
Year
2023
Date
30 January
Shift
Evening Shift
Subject
Chemistry
Chapter
Classification of Elements and Periodicity in Properties

JEE Main 2023 · 30 January · Evening Shift · Chemistry · Classification of Elements and Periodicity in Properties

Bond dissociation energy of E - H bond of the " H _ 2 E " hydrides...

Bond dissociation energy of E−HE - H bond of the "H2E{H}_{2}E" hydrides of group 1616 elements (given below), follows order.
(A) OO
(B) SS
(C) SeSe
(D) TeTe

Options

  1. AA>B>C>DA > B > C > D
  2. BA>B>D>CA > B > D > C
  3. CB>A>C>DB > A > C > D
  4. DD>C>B>AD > C > B > A

Correct answer

A. A>B>C>DA > B > C > D

Step-by-step solution

Bond strength is inversely proportional to the bond length of E−HE - H bond of hydrides of 16th group hydrides. The bond length increases down the group. Hence, bond dissociation enthalpy decreases down the group.

Hence, bond dissociation energy of E−HE - H bond in hydrides of group 16 follows the order

H2O>H2S>H2Se>H2Te{H}_{2}O > {H}_{2}S > {H}_{2}Se > {H}_{2}Te.

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