10 public questions tagged with this topic.
Passage supports 'Iron is the most useful'; text explicitly states this. Answer matches.
Ref: NCERT Class 10 English reading comprehension guide answers must be directly supported by passage details central theme explicit statements.
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.
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
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
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
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
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
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
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
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
