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JEE Main
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Chemistry
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Practical Chemistry

JEE Main · Chemistry · Practical Chemistry

Match List I with List II regarding the observations when aqueous...

Match List I with List II regarding the observations when aqueous solutions of the given metal cations are treated with potassium ferrocyanide, K4[Fe(CN)6]\mathrm{K}_4[\mathrm{Fe}(\mathrm{CN})_6].

List I (Metal Cation)List II (Observation)
(A) Cu2+\mathrm{Cu}^{2+}(I) White precipitate
(B) Fe3+\mathrm{Fe}^{3+}(II) Chocolate brown precipitate
(C) Zn2+\mathrm{Zn}^{2+}(III) Prussian blue precipitate
(D) Fe2+\mathrm{Fe}^{2+}(IV) White precipitate which rapidly turns blue on exposure to air

Choose the correct answer from the options given below:

Options

  1. A(A)-(II), (B)-(III), (C)-(I), (D)-(IV)
  2. B(A)-(II), (B)-(IV), (C)-(I), (D)-(III)
  3. C(A)-(III), (B)-(II), (C)-(I), (D)-(IV)
  4. D(A)-(II), (B)-(III), (C)-(IV), (D)-(I)

Correct answer

A. (A)-(II), (B)-(III), (C)-(I), (D)-(IV)

Step-by-step solution

When aqueous solutions of metal cations react with potassium ferrocyanide, K4[Fe(CN)6]\mathrm{K}_4[\mathrm{Fe}(\mathrm{CN})_6]:

(A) Cu2+\mathrm{Cu}^{2+} reacts to form a chocolate brown precipitate of cupric ferrocyanide, Cu2[Fe(CN)6]\mathrm{Cu}_2[\mathrm{Fe}(\mathrm{CN})_6].

(B) Fe3+\mathrm{Fe}^{3+} reacts to form a Prussian blue precipitate of ferric ferrocyanide, Fe4[Fe(CN)6]3\mathrm{Fe}_4[\mathrm{Fe}(\mathrm{CN})_6]_3.

(C) Zn2+\mathrm{Zn}^{2+} reacts to form a white or bluish-white precipitate of K2Zn3[Fe(CN)6]2\mathrm{K}_2\mathrm{Zn}_3[\mathrm{Fe}(\mathrm{CN})_6]_2.

(D) Fe2+\mathrm{Fe}^{2+} reacts to form a white precipitate of Everitt's salt, K2Fe[Fe(CN)6]\mathrm{K}_2\mathrm{Fe}[\mathrm{Fe}(\mathrm{CN})_6], which rapidly oxidizes in air to form Prussian blue.

Therefore, the correct matching is (A)-(II), (B)-(III), (C)-(I), (D)-(IV).

Answer: (A)-(II), (B)-(III), (C)-(I), (D)-(IV)
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