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The reaction of K3[Fe(CN)6] with freshly prepared FeSO4 solution produces a dark blue precipitate called Turnbull's blue. Reaction of K4[Fe(CN)6] with the FeSO4 solution in complete absence of air produces a white precipitate X, which turns blue in air. Mixing the FeSO4 solution with NaNO3, followed by a slow addition of concentrated H2SO4 through the side of the test tube produces a brown ring.
Q. Precipitate X is
  • a)
    Fe4[Fe(CN)6]3
  • b)
    Fe[Fe(CN)6]
  • c)
    K2Fe[Fe(CN)6]
  • d)
    KFe[Fe(CN)6]
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
The reaction of K3[Fe(CN)6] with freshly prepared FeSO4 solution produ...
Precipitate X is K2Fe[Fe(CN)6].

Explanation:
When FeSO4 solution is added to K3[Fe(CN)6], it produces Turnbulls blue precipitate, which is Fe4[Fe(CN)6]3. However, when FeSO4 solution is added to K4[Fe(CN)6] in the absence of air, it produces a white precipitate X. This is because K4[Fe(CN)6] is a stronger oxidizing agent than K3[Fe(CN)6] and oxidizes Fe2+ to Fe3+ faster, forming K2Fe[Fe(CN)6], which is white in color.

When precipitate X is exposed to air, it turns blue. This is because K2Fe[Fe(CN)6] is a ferrocyanide, which can further oxidize to ferricyanide in the presence of air. Ferricyanide is blue in color, and hence the white precipitate X turns blue.

When FeSO4 solution is mixed with NaNO3 and concentrated H2SO4 is added slowly through the side of the test tube, a brown ring is formed. This is due to the formation of Fe(NO3)3 in the acidic medium, which reacts with FeSO4 to form Fe2(SO4)3. This Fe2(SO4)3 then reacts with NaNO3 to form a brown ring of Fe(NO)3 in the test tube.
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The reaction of K3[Fe(CN)6] with freshly prepared FeSO4 solution produ...
Precipitate X is K2Fe[Fe(CN)6].
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The reaction of K3[Fe(CN)6] with freshly prepared FeSO4 solution produces a dark blue precipitate called Turnbulls blue. Reaction of K4[Fe(CN)6] with the FeSO4 solution in complete absence of air produces a white precipitate X, which turns blue in air. Mixing the FeSO4 solution with NaNO3, followed by a slow addition of concentrated H2SO4 through the side of the test tube produces a brown ring.Q.Precipitate X isa)Fe4[Fe(CN)6]3b)Fe[Fe(CN)6]c)K2Fe[Fe(CN)6]d)KFe[Fe(CN)6]Correct answer is option 'C'. Can you explain this answer?
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The reaction of K3[Fe(CN)6] with freshly prepared FeSO4 solution produces a dark blue precipitate called Turnbulls blue. Reaction of K4[Fe(CN)6] with the FeSO4 solution in complete absence of air produces a white precipitate X, which turns blue in air. Mixing the FeSO4 solution with NaNO3, followed by a slow addition of concentrated H2SO4 through the side of the test tube produces a brown ring.Q.Precipitate X isa)Fe4[Fe(CN)6]3b)Fe[Fe(CN)6]c)K2Fe[Fe(CN)6]d)KFe[Fe(CN)6]Correct answer is option 'C'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about The reaction of K3[Fe(CN)6] with freshly prepared FeSO4 solution produces a dark blue precipitate called Turnbulls blue. Reaction of K4[Fe(CN)6] with the FeSO4 solution in complete absence of air produces a white precipitate X, which turns blue in air. Mixing the FeSO4 solution with NaNO3, followed by a slow addition of concentrated H2SO4 through the side of the test tube produces a brown ring.Q.Precipitate X isa)Fe4[Fe(CN)6]3b)Fe[Fe(CN)6]c)K2Fe[Fe(CN)6]d)KFe[Fe(CN)6]Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The reaction of K3[Fe(CN)6] with freshly prepared FeSO4 solution produces a dark blue precipitate called Turnbulls blue. Reaction of K4[Fe(CN)6] with the FeSO4 solution in complete absence of air produces a white precipitate X, which turns blue in air. Mixing the FeSO4 solution with NaNO3, followed by a slow addition of concentrated H2SO4 through the side of the test tube produces a brown ring.Q.Precipitate X isa)Fe4[Fe(CN)6]3b)Fe[Fe(CN)6]c)K2Fe[Fe(CN)6]d)KFe[Fe(CN)6]Correct answer is option 'C'. Can you explain this answer?.
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