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JEE Main 202227 JulyMorning Shift
Exam
JEE Main
Year
2022
Date
27 July
Shift
Morning Shift
Subject
Chemistry
Chapter
d and f Block Elements

JEE Main 2022 · 27 July · Morning Shift · Chemistry · d and f Block Elements

Given below are two statements: Statement I : Iron (III) catalyst,...

Given below are two statements:

Statement I : Iron (III) catalyst, acidified K2Cr2O7{K}_{2}{Cr}_{2}{O}_{7} and neutral KMnO4{KMnO}_{4} have the ability to oxidise I−{I}^{-} to I2{I}_{2} independently.

Statement II: Manganate ion is paramagnetic in nature and involves pπ−pπp \pi - p \pi bonding.

In the light of the above statements, choose the correct answer from the options.

Given below are two statements: Statement I : Iron (III) catalyst, acidified K _ 2 Cr _ 2 O _ 7 and neutral KMnO _ 4

Options

  1. ABoth statement I and Statement II are ture
  2. BBoth statement I and Statement II are false
  3. CStatement I is true but Statement II is false
  4. DStatement I is false but Statement II is true

Correct answer

B. Both statement I and Statement II are false

Step-by-step solution

Iodine is liberated from potassium iodide.

10I−+2MnO4−+16H+→2Mn2++8H2O+5I210{I}^{-} + 2{MnO}_{4}^{-} + 16{H}^{+}\overset{}{\to}2{Mn}^{2 +} + 8{H}_{2}O + 5{I}_{2}

K2Cr2O7Potassiumdichromate+7H2SO4+6KI→Cr2(SO4)3+3I2+4K2SO4+7H2O\mathop{{K}_{2}{Cr}_{2}{O}_{7}}_{Potassiumdichromate} + 7{H}_{2}{SO}_{4} + 6KI \to {Cr}_{2}{\left({SO}_{4}\right)}_{3} + 3{I}_{2} + 4{K}_{2}{SO}_{4} + 7{H}_{2}O

2Fe3++2KI→2Fe2++I2+2K+2{Fe}^{3 +} + 2KI \to 2{Fe}^{2 +} + {I}_{2} + 2{K}^{+}

Given below are two statements: Statement I : Iron (III) catalyst, acidified K _ 2 Cr _ 2 O _ 7 and neutral KMnO _ 4

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