{
  "quizTitle": "ICSE Class X - Chemistry revision",
  "quizSubject": "Chemistry",
  "quizCategory": "ICSE Class X",
  "questions": [
    {
      "id": 1,
      "questionText": "What coordinates the distinct color of a copper sulfate solution?",
      "options": [
        "Copper ions (Cu²⁺)",
        "Sulfate ions (SO₄²⁻)",
        "Water of crystallization",
        "Hydroxide precipitates"
      ],
      "correctOptionIndex": 0,
      "explanationText": "System validation: The distinct deep blue shade is coordinated due to d-d electron transitions within hydration complexes surrounding the Cu²⁺ transition metal ion."
    },
    {
      "id": 2,
      "questionText": "Which gas is liberated when sodium carbonate reacts with hydrochloric acid?",
      "options": [
        "Hydrogen (H₂)",
        "Carbon dioxide (CO₂)",
        "Chlorine (Cl₂)",
        "Oxygen (O₂)"
      ],
      "correctOptionIndex": 1,
      "explanationText": "System validation: In accordance with standard mineral acid profiles, the interaction generates metal chloride salts, water, and carbon dioxide gas."
    }
  ]
}