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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. Among the following, the brown ring is due to the formation of
  • a)
    [Fe(NO)2(SO4)2]2-
  • b)
    [Fe(NO)2(H2O)4]3+
  • c)
    [Fe(NO)4(SO4)2]
  • d)
    [Fe(NO)(H2O)5]2+
Correct answer is option 'D'. Can you explain this answer?
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The reaction of K3[Fe(CN)6] with freshly prepared FeSO4 solution produ...
Formation of the Brown Ring
- The brown ring formed in the reaction is due to the formation of [Fe(NO)(H2O)5]2+.
- When FeSO4 solution reacts with NaNO3 and concentrated H2SO4, the following reaction takes place:
FeSO4 + 6NaNO3 + H2SO4 → [Fe(NO)(H2O)5]2+ + SO2 + 3H2O + 6NaHSO4

Explanation of the Reaction
- In the presence of NaNO3 and H2SO4, Fe2+ ions from FeSO4 react with NO3- ions to form a complex ion [Fe(NO)(H2O)5]2+.
- The brown ring is formed due to the complex ion [Fe(NO)(H2O)5]2+.
- The NO3- ions from NaNO3 oxidize Fe2+ ions to Fe3+ ions, forming the complex ion [Fe(NO)(H2O)5]2+.
- The complex ion [Fe(NO)(H2O)5]2+ has a brown color, resulting in the brown ring formation at the junction of the two layers in the test tube.

Conclusion
- The formation of the brown ring in the given reaction is attributed to the complex ion [Fe(NO)(H2O)5]2+.
- This reaction is a classic demonstration of the formation of complex ions and their distinct colors.
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The reaction of K3[Fe(CN)6] with freshly prepared FeSO4 solution produ...
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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. Among the following, the brown ring is due to the formation ofa)[Fe(NO)2(SO4)2]2-b)[Fe(NO)2(H2O)4]3+c)[Fe(NO)4(SO4)2]d)[Fe(NO)(H2O)5]2+Correct answer is option 'D'. 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. Among the following, the brown ring is due to the formation ofa)[Fe(NO)2(SO4)2]2-b)[Fe(NO)2(H2O)4]3+c)[Fe(NO)4(SO4)2]d)[Fe(NO)(H2O)5]2+Correct answer is option 'D'. 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. Among the following, the brown ring is due to the formation ofa)[Fe(NO)2(SO4)2]2-b)[Fe(NO)2(H2O)4]3+c)[Fe(NO)4(SO4)2]d)[Fe(NO)(H2O)5]2+Correct answer is option 'D'. 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. Among the following, the brown ring is due to the formation ofa)[Fe(NO)2(SO4)2]2-b)[Fe(NO)2(H2O)4]3+c)[Fe(NO)4(SO4)2]d)[Fe(NO)(H2O)5]2+Correct answer is option 'D'. Can you explain this answer?.
Solutions 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. Among the following, the brown ring is due to the formation ofa)[Fe(NO)2(SO4)2]2-b)[Fe(NO)2(H2O)4]3+c)[Fe(NO)4(SO4)2]d)[Fe(NO)(H2O)5]2+Correct answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for JEE. Download more important topics, notes, lectures and mock test series for JEE Exam by signing up for free.
Here you can find the meaning of 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. Among the following, the brown ring is due to the formation ofa)[Fe(NO)2(SO4)2]2-b)[Fe(NO)2(H2O)4]3+c)[Fe(NO)4(SO4)2]d)[Fe(NO)(H2O)5]2+Correct answer is option 'D'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of 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. Among the following, the brown ring is due to the formation ofa)[Fe(NO)2(SO4)2]2-b)[Fe(NO)2(H2O)4]3+c)[Fe(NO)4(SO4)2]d)[Fe(NO)(H2O)5]2+Correct answer is option 'D'. Can you explain this answer?, a detailed solution 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. Among the following, the brown ring is due to the formation ofa)[Fe(NO)2(SO4)2]2-b)[Fe(NO)2(H2O)4]3+c)[Fe(NO)4(SO4)2]d)[Fe(NO)(H2O)5]2+Correct answer is option 'D'. Can you explain this answer? has been provided alongside types of 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. Among the following, the brown ring is due to the formation ofa)[Fe(NO)2(SO4)2]2-b)[Fe(NO)2(H2O)4]3+c)[Fe(NO)4(SO4)2]d)[Fe(NO)(H2O)5]2+Correct answer is option 'D'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice 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. Among the following, the brown ring is due to the formation ofa)[Fe(NO)2(SO4)2]2-b)[Fe(NO)2(H2O)4]3+c)[Fe(NO)4(SO4)2]d)[Fe(NO)(H2O)5]2+Correct answer is option 'D'. Can you explain this answer? tests, examples and also practice JEE tests.
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