7 public questions tagged with this topic.
Methanol (CH₃OH) reacts with Na to release H₂ gas, which burns with a pop sound, due to its acidic hydrogen.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Classification and Nomenclature and Structures of Alcohols Phenols Ethers
Phenol (C₆H₅OH) reacts with Na to form sodium phenoxide and releases hydrogen gas (H₂), indicating its acidic nature.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Classification and Nomenclature and Structures of Alcohols Phenols Ethers
For H₂(g) → 2H(g), Δ H = 2 × Δ Hf (H) - Δ Hf (H₂) = 2 × 218 - 0 = 436 kJ/mol, which is the bond enthalpy.
Ref: NCERT Class 11 Chemistry > Chapter 5: Thermodynamics > Topic: Bond Enthalpy and Entropy and Spontaneity
Reaction: Fe + 2HCl → FeCl₂ + H₂. Moles of H₂ = 8.96/22.4 = 0.4 mol. 1 mol H₂ from 1 mol Fe; mass = 0.4 × 56 = 22.4 g.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Stoichiometry and Stoichiometric Calculations and Limiting Reagent
Reaction: Zn + 2HCl → ZnCl₂ + H₂. Moles of H₂ = 4.48/22.4 = 0.2 mol. 1 mol H₂ from 1 mol Zn; mass = 0.2 × 65 = 13 g.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Laws of Chemical Combination - Conservation Mass Definite Multiple
Reaction: 2Al + 6HCl → 2AlCl₃ + 3H₂. Moles of H₂ = 5.6/22.4 = 0.25 mol. 3 mol H₂ from 2 mol Al; 0.25 mol from (2/3)×0.25 ≈ 0.1667 mol Al. Mass = 0.1667 × 27 ≈ 4.5 g.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Importance and Nature of Chemistry and Properties of Matter
Reaction: Zn + H₂SO₄ → ZnSO₄ + H₂. Moles of H₂ = 2.24/22.4 = 0.1 mol. 1 mol H₂ from 1 mol Zn; mass = 0.1 × 65 = 6.5 g.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Importance and Nature of Chemistry and Properties of Matter
