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Chemistry · Periodicity of Elements and Periodic Properties

JEE Main 2026 — 2 April, Morning Shift — Question 48

Given below are two statements :

Statement (I) : Oxidising power of halogens decreases in the order F2>Cl2>Br2>I2\mathrm{F}_{2}>\mathrm{Cl}_{2}>\mathrm{Br}_{2}>\mathrm{I}_{2}, which is the basis of Layer test.

Statement (II): Layer test to identify Br2\mathrm{Br}_{2} and I2\mathrm{I}_{2} in aqueous solution involves the oxidation of bromide or iodide into Br2\mathrm{Br}_{2} or I2\mathrm{I}_{2} respectively with Cl2\mathrm{Cl}_{2}, which is a type of displacement redox reaction.

In the light of the above statements, choose the correct answer from the options given below:

  1. Option A:

    Both Statement I and Statement II are true

    Correct
  2. Option B:

    Both Statement I and Statement II are false

  3. Option C:

    Statement I is true but Statement II is false

  4. Option D:

    Statement I is false but Statement II is true

Answer: A

Step-by-step solution

(I) F2>Cl2>Br2>I2\mathrm{F}_{2}>\mathrm{Cl}_{2}>\mathrm{Br}_{2}>\mathrm{I}_{2} (Oxidizing power order) (II) NaBr+Cl2\mathrm{NaBr}+\mathrm{Cl}_{2}-water →Br2+NaCl\rightarrow \mathrm{Br}_{2}+\mathrm{NaCl} NaI+Cl2\mathrm{NaI}+\mathrm{Cl}_{2}-water →I2+NaCl\rightarrow \mathrm{I}_{2}+\mathrm{NaCl}

Answer key and solution verified before publishing.

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Exam
JEE Main 2026
Paper
2 April, Morning Shift
Subject
Chemistry
Chapter
Periodicity of Elements and Periodic Properties
Topic
Periodicity in Chemical Properties (Ionization Energy, Electron Affinity, Electronegativity)

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