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JEE Main 20231 FebruaryMorning Shift
Exam
JEE Main
Year
2023
Date
1 February
Shift
Morning Shift
Subject
Chemistry
Chapter
d and f Block Elements

JEE Main 2023 · 1 February · Morning Shift · Chemistry · d and f Block Elements

A solution of FeCl _ 3 when treated with K _ 4 [Fe ( CN ) _ 6 ]...

A solution of FeCl3{FeCl}_{3} when treated with K4[Fe(CN)6]{K}_{4}\left[Fe ( CN{)}_{6}\right] gives a prussian blue precipitate due to the formation of

Options

  1. AK[Fe2(CN)6]K\left[{Fe}_{2} ( CN{)}_{6}\right]
  2. BFe[Fe(CN)6]Fe\left[Fe ( CN{)}_{6}\right]
  3. C{Fe}_{3}{\left[Fe ( CN{)}_{6}\right]}_{2}
  4. D{Fe}_{4}{\left[Fe ( CN{)}_{6}\right]}_{3}

Correct answer

D. {Fe}_{4}{\left[Fe ( CN{)}_{6}\right]}_{3}

Step-by-step solution

Addition of FeCl3{FeCl}_{3} to K4{K}_{4}\left[Fe{\left(CN\right)}_{6}\right] in dilute and cold solution gives a solution, prussian blue solution Fe4[Fe(CN)6]3{Fe}_{4}{\left[Fe{\left(CN\right)}_{6}\right]}_{3}.

The reaction is as follows:

4FeCl3+3K4[Fe(CN)6]→Fe4[Fe(CN)6]3+12KCl4{FeCl}_{3} + 3{K}_{4} [ Fe ( CN{)}_{6} ] \to {Fe}_{4} [ Fe ( CN{)}_{6}{]}_{3} + 12KCl

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