JEE Main 2021 — Hydrogen Question with Solution
From: JEE Main 2021 (Online) 20th July Morning Shift
Question
Given below are two statements : One is labelled as Assertion A and other is labelled as Reason R.
Assertion A : The dihedral angles in H2O2 in gaseous phase is 90.2 and in solid phase is 111.5.
Reason R : The change in dihedral angle in solid and gaseous phase is due to the difference in the intermolecular forces.
Choose the most appropriate answer from the options given below for A and R.
Assertion A : The dihedral angles in H2O2 in gaseous phase is 90.2 and in solid phase is 111.5.
Reason R : The change in dihedral angle in solid and gaseous phase is due to the difference in the intermolecular forces.
Choose the most appropriate answer from the options given below for A and R.
Choose an option
Show full solutionCorrect option: D
Correct answer
DA is not correct but R is correct.
Step-by-step explanation
(a) H2O2 structure in gas phase, dihedral angle is 111.5°.
(b) H2O2 structure in solid phase at 110K, dihedral angle is 90.2°
Hence given statement (A) is not correct.
But statement (B) is correct.
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This is a previous-year question from JEE Main 2021, covering the Hydrogen chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.