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A blue colour complex is obtained in the analysis of Fe+3 having formula Fe4[Fe(CN)6]3
Let a = oxidation number of iron in the coordination sphere, b = no. of secondary valencies of central iron ion. C = Effective atomic number of iron in the coordination sphere.
Then find the value of (c + a − 2b).
Correct answer is '26'. Can you explain this answer?
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A blue colour complex is obtained in the analysis of Fe+3 having form...
Let's analyze the given information step by step.
1. Formula of the complex:
The formula of the complex is Fe4[Fe(CN)6]3. This indicates that the complex contains four Fe ions and three [Fe(CN)6]3- ions.
2. Oxidation number of iron in the coordination sphere (a):
To determine the oxidation number of iron in the coordination sphere, we need to consider the charge of the complex. Since [Fe(CN)6]3- has a charge of -3, the total charge contributed by the [Fe(CN)6]3- ions is 3 × (-3) = -9. Since the overall charge of the complex is neutral, the sum of the oxidation numbers of all the Fe ions must be +9. Since there are four Fe ions, the average oxidation number of iron in the coordination sphere is +9/4 = +2.25. However, since oxidation numbers can only be integers, we can assume that the oxidation number of iron is +2.
3. Number of secondary valencies of central iron ion (b):
The central iron ion in the complex is surrounded by six CN- ligands, which act as monodentate ligands. Each CN- ligand donates one electron pair to the central iron ion, forming a single bond. Therefore, the number of secondary valencies of the central iron ion is equal to the coordination number, which is 6. Hence, b = 6.
4. Effective atomic number of iron in the coordination sphere (C):
The effective atomic number of iron in the coordination sphere takes into account the electrons donated by the ligands. In the case of [Fe(CN)6]3-, each CN- ligand donates one electron pair. Therefore, the effective atomic number of iron is equal to the atomic number of iron plus the number of electrons donated by the ligands. The atomic number of iron is 26, and each CN- ligand donates one electron pair, so the effective atomic number of iron is 26 + (6 × 2) = 38.
5. Value of (c - a - 2b):
Substituting the values we have obtained, (c - a - 2b) = 38 - 2 - 2(6) = 38 - 2 - 12 = 24.
Therefore, the correct answer is not 26, but 24.
1. Formula of the complex:
The formula of the complex is Fe4[Fe(CN)6]3. This indicates that the complex contains four Fe ions and three [Fe(CN)6]3- ions.
2. Oxidation number of iron in the coordination sphere (a):
To determine the oxidation number of iron in the coordination sphere, we need to consider the charge of the complex. Since [Fe(CN)6]3- has a charge of -3, the total charge contributed by the [Fe(CN)6]3- ions is 3 × (-3) = -9. Since the overall charge of the complex is neutral, the sum of the oxidation numbers of all the Fe ions must be +9. Since there are four Fe ions, the average oxidation number of iron in the coordination sphere is +9/4 = +2.25. However, since oxidation numbers can only be integers, we can assume that the oxidation number of iron is +2.
3. Number of secondary valencies of central iron ion (b):
The central iron ion in the complex is surrounded by six CN- ligands, which act as monodentate ligands. Each CN- ligand donates one electron pair to the central iron ion, forming a single bond. Therefore, the number of secondary valencies of the central iron ion is equal to the coordination number, which is 6. Hence, b = 6.
4. Effective atomic number of iron in the coordination sphere (C):
The effective atomic number of iron in the coordination sphere takes into account the electrons donated by the ligands. In the case of [Fe(CN)6]3-, each CN- ligand donates one electron pair. Therefore, the effective atomic number of iron is equal to the atomic number of iron plus the number of electrons donated by the ligands. The atomic number of iron is 26, and each CN- ligand donates one electron pair, so the effective atomic number of iron is 26 + (6 × 2) = 38.
5. Value of (c - a - 2b):
Substituting the values we have obtained, (c - a - 2b) = 38 - 2 - 2(6) = 38 - 2 - 12 = 24.
Therefore, the correct answer is not 26, but 24.
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A blue colour complex is obtained in the analysis of Fe+3 having form...
The dissociation of given complex occurs as:
Fe4[Fe(CN)6]3 → Fe3+ + [Fe(CN)6]4−
Here the coordination sphere is [Fe(CN)6]4−
The oxidation number of FeFe in the coordination sphere can be calculated as:
x − 6 = −4
x = +2
Thus, a = 2
There are 6 CN atoms around Fe ions,
Therefore,
b = Number of secondary valencies of central iron ion = 6
Effective atomic number of iron in the coordination sphere can be calculated as
EAN = Z − Oxidation no. + 2 × Coordination no.
EAN = 26 − 2 + 2 × 6
EAN = 36
c = Effective atomic number of iron = 36
Now,
The value of (c + a − 2b) can be calculated as:
(c + a − 2b) = 36 + 2 − 2 × 6 = 26
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A blue colour complex is obtained in the analysis of Fe+3 having formula Fe4[Fe(CN)6]3Let a = oxidation number of iron in the coordination sphere, b = no. of secondary valencies of central iron ion. C = Effective atomic number of iron in the coordination sphere.Then find the value of (c + a − 2b).Correct answer is '26'. Can you explain this answer?
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A blue colour complex is obtained in the analysis of Fe+3 having formula Fe4[Fe(CN)6]3Let a = oxidation number of iron in the coordination sphere, b = no. of secondary valencies of central iron ion. C = Effective atomic number of iron in the coordination sphere.Then find the value of (c + a − 2b).Correct answer is '26'. 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 A blue colour complex is obtained in the analysis of Fe+3 having formula Fe4[Fe(CN)6]3Let a = oxidation number of iron in the coordination sphere, b = no. of secondary valencies of central iron ion. C = Effective atomic number of iron in the coordination sphere.Then find the value of (c + a − 2b).Correct answer is '26'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A blue colour complex is obtained in the analysis of Fe+3 having formula Fe4[Fe(CN)6]3Let a = oxidation number of iron in the coordination sphere, b = no. of secondary valencies of central iron ion. C = Effective atomic number of iron in the coordination sphere.Then find the value of (c + a − 2b).Correct answer is '26'. Can you explain this answer?.
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