The D and F Block Elements — Class 12 Chemistry NCERT Solutions (Free)
Free step-by-step NCERT solutions for Class 12 Chemistry chapter "The D and F Block Elements" — 6 important questions with detailed answers for CBSE board exam preparation.
TL;DR: Free step-by-step NCERT solutions for Class 12 Chemistry chapter "The D and F Block Elements" — 6 important questions with detailed answers for CBSE b…
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Key Questions Covered:
- Define transition elements. What are the characteristic properties of transit…
- Compare the properties of Cr and Mn. Why do they differ?
- Discuss the chemistry of potassium permanganate (KMnO₄). What is its structur…
- + 3 more questions in the full chapter
Solutions Summary:
| Question | Status |
|---|---|
| Define transition elements. What are the characteristic p… | ✓ Solved |
| Compare the properties of Cr and Mn. Why do they differ? | ✓ Solved |
| Discuss the chemistry of potassium permanganate (KMnO₄). … | ✓ Solved |
Showing 3 of 6 questions
Q1: Define transition elements. What are the characteristic properties of transition metals?
Transition Elements:
Elements with incompletely filled d-orbitals in their atoms or cations, or those with tendency to form ions by loss of electrons from d-orbitals.
They occupy the d-block of periodic table (Groups 3-12, Periods 4-6).
Characteristic Properties:
1. Variable Oxidation States:
Mult...
Q2: Compare the properties of Cr and Mn. Why do they differ?
Chromium (Cr) vs Manganese (Mn):
Both are in Period 4 of d-block. Electron configurations:
Cr: [Ar] 3d⁵ 4s¹ (half-filled d-orbital)
Mn: [Ar] 3d⁵ 4s² (half-filled d-orbital + filled s-orbital)
Comparison:
Property | Chromium | Manganese
---------|----------|----------
Atomic number | 24 | 25
Electr...
Q3: Discuss the chemistry of potassium permanganate (KMnO₄). What is its structure and oxidizing properties?
Potassium Permanganate (KMnO₄):
Structure:
Molecular formula: KMnO₄
Ionic compound containing K⁺ and MnO₄⁻ ions
MnO₄⁻ ion structure (tetrahedral):
1. Mn is in +7 oxidation state
2. Four oxygen atoms surround Mn (tetrahedral arrangement)
3. Oxygen atoms form covalent bonds with Mn
4. Total charge: ...
Showing 3 of 6 questions. Visit the full page for complete solutions.