#iron

CHEMISTRY

What is the oxidation state of iron in K₄[Fe(CN)6] ?

Given: What is the oxidation state of iron in K₄[Fe(CN)6] ? These values define the system as per NCERT data. Formula: Each CN^- is -1, 6 ligands = -6. This is standard NCERT relation. Substitution & Calculation: The complex [Fe(CN)6]^{4- is balanced by 4 K⁺, so Fe’s oxidation state is x - 6 = -4, x = +2 . Result: The computed value matches expected outcome and confirms correct choice as per NCERT.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom, Periodicity and relevant Chemistry topic, Topic: Mole concept and periodic trends.

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Isomerism - Optical Isomerism and Linkage Ionisation Solvate

What is the oxidation state of iron in [Fe(H₂O)4Cl₂]?

In [Fe(H₂O)4Cl₂], H₂O is neutral, each Cl− is −1. The complex is neutral, so x + 0 + 2(−1) = 0, x = +2.

Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Isomerism - Optical Isomerism and Linkage Ionisation Solvate

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Isomerism - Geometrical Isomerism in Coordination Compounds

What is the oxidation state of Fe in [Fe(H₂O)5NO]+?

In [Fe(H₂O)5NO]+, NO is NO+ (+1), 5 H₂O are neutral. Charge = +1, so x + 0 + 1 = +1, x = 0 is incorrect; typically Fe is +2 with NO+.

Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Isomerism - Geometrical Isomerism in Coordination Compounds

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Isomerism - Geometrical Isomerism in Coordination Compounds

What is the total number of atoms directly bonded to the metal in [Fe(en)(H₂O)3Cl]+?

In [Fe(en)(H₂O)3Cl]+, en (bidentate) has 2 N atoms, 3 H₂O have 3 O atoms, and 1 Cl− has 1 Cl atom. Total = 2 + 3 + 1 = 6.

Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Isomerism - Geometrical Isomerism in Coordination Compounds

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Applications of d and f Block Elements

Which of the following is used as a catalyst in the Haber process?

Finely divided iron (Fe) catalyzes the reaction: N 2 + 3H 2 → 2NH 3 .

Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Applications of d and f Block Elements

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Electrochemical Cells - Galvanic Cells and Electrode Potential

What is the standard cell potential for a galvanic cell where iron is oxidized and silver ions are reduced? (Given: E°Fe

Reaction: Fe(s) + 2Ag⁺(aq) → Fe²⁺(aq) + 2Ag(s) . E°cell = E°cathode - E°anode = 0.80 - (-0.44) = 1.24 V .

Ref: NCERT Class 12 Chemistry > Chapter 2: Electrochemistry > Topic: Electrochemical Cells - Galvanic Cells and Electrode Potential

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Redox Titrations and Equivalent Weight and Normality

In the reaction 2Fe + 3Cl₂ → 2FeCl₃, what is the reducing agent?

The reducing agent is oxidized. Fe (0) loses electrons to become Fe (+3) in FeCl₃, reducing Cl₂.

Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Redox Titrations and Equivalent Weight and Normality

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Electrode Potential and Electrochemical Series and Galvanic Cells

What is the oxidation number of iron in Fe₃(PO₄)2?

Let Fe = x. PO₄³− has P (+5) and O (-2): +5 + 4(-2) = -3. For Fe₃(PO₄)2: 3x + 2(-3) = 0, 3x - 6 = 0, x = +2.

Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Electrode Potential and Electrochemical Series and Galvanic Cells

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Anomalous Properties and Second Period and Chemical Reactivity

Which element has the ground state electronic configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁶ 4s²?

This configuration (Z=26) corresponds to Fe (period 4, group 8), with 3d⁶ 4s², distinguishing it from Mn (3d⁵ 4s²), Co (3d⁷ 4s²), or Ni (3d⁸ 4s²).

Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Anomalous Properties and Second Period and Chemical Reactivity

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