9 public questions tagged with this topic.
E°cell = E°cathode - E°anode = 0.80 - (-2.36) = 3.16 V .
Ref: NCERT Class 12 Chemistry > Chapter 2: Electrochemistry > Topic: Variation of Conductivity with Concentration and Measurement
Cathode: Mg²⁺ + 2e⁻ → Mg . Moles = (0.24/24) = 0.01 mol , Charge = 0.01 × 2 × 96500 = 1930 C . Anode: 2Cl⁻ → Cl₂ + 2e⁻ . Moles Cl₂ = 0.01 mol , Volume = 0.01 × 22.4 = 0.224 L .
Ref: NCERT Class 12 Chemistry > Chapter 2: Electrochemistry > Topic: Electrolytic Cells and Electrolysis and Faraday's Laws
Mg²⁺ + 2e⁻ → Mg . 1 mol Mg (24 g) requires 2F. Moles = (0.81/24) = 0.03375 mol , Charge = 0.03375 × 2 × 96500 = 6513.75 C .
Ref: NCERT Class 12 Chemistry > Chapter 2: Electrochemistry > Topic: Electrolytic Cells and Electrolysis and Faraday's Laws
Mg²⁺ + 2e⁻ → Mg . 1 mol Mg (24 g) requires 2F. Moles = (20/24) = 0.833 mol , Charge = 0.833 × 2 = 1.67 F .
Ref: NCERT Class 12 Chemistry > Chapter 2: Electrochemistry > Topic: Electrolytic Cells and Electrolysis and Faraday's Laws
The reducing agent donates electrons. Mg (0) loses electrons to form Mg²⁺ (+2), reducing H+.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Oxidizing and Reducing Agents and Strength
Atomic radius increases down a group due to additional electron shells. For group 2: Be < Mg < Ca.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Periodic Trends - Atomic Radii Ionic Radii and Ionization Enthalpy
Mg (group 2, valence 2) and N (group 15, valence 3) form Mg₃N₂ by cross-multiplying valences.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Modern Periodic Law and Present Form - Long Form Periodic Table
For 100 g: Mg = 24 g, S = 28 g, O = 48 g. Moles: Mg = 1, S = 0.875, O = 3. Ratio ≈ 1 : 1 : 3 (adjusted); empirical formula = MgSO₃.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Dalton's Atomic Theory and Atomic and Molecular Masses
DNA synthesis proceeds via nucleophilic attack of primer 3' hydroxyl on alpha-phosphate of incoming dNTP. Two Mg2+ ions, coordinated by conserved aspartate residues in polymerase active site, orchestrate catalysis. One ion activates 3'OH lowering pKa for attack, the other stabilizes pentacovalent transition state and facilitates pyrophosphate departure. Without Mg2+, phosphodiester bond formation stalls entirely. This two-metal mechanism explains why chelators like EDTA inhibit polymerization, why Ca2+ fails to substitute effectively, and why high fidelity polymerases absolutely require magnesium for both polymerase and exonuclease activities.
Ref: Alberts et al., Molecular Biology of the Cell, 7th ed., Chapter 5: DNA Replication Mechanisms, Two-metal-ion catalysis
