The passage of current through a solution of certain electrolye results in the evolution of H₂ at cathode and Cl₂ at ano
A NaCl correct as per chemistry principle.
Ref: NCERT Chemistry Class XII — Electrochemistry
#hydrogen gas
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What are the gaseous products liberated at anode and cathode respectively when dilute aqueous solution of Sulphuric acid
Dilute H₂SO₄ anode O₂ cathode H₂ water electrolysis.
Ref: NCERT Chemistry Class XII — Electrochemistry
Which alcohol reacts with Na to produce a gas that burns with a pop sound?
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
What gas is evolved when phenol reacts with sodium metal?
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
Calculate the bond enthalpy of H-H in H₂(g) given Δ Hf (H,g) = 218 kJ/mol.
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
How many grams of Fe are required to produce 8.96 L of H₂ at STP with excess HCl? (Atomic mass: Fe = 56)
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
How many grams of Zn are required to produce 4.48 L of H₂ at STP with excess HCl? (Atomic mass: Zn = 65)
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
How many grams of Al are required to produce 5.6 L of H₂ at STP with excess HCl? (Atomic mass: Al = 27)
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
How many grams of Zn are required to produce 2.24 L of H₂ at STP with excess H₂SO₄? (Atomic mass: Zn = 65)
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
