Q1. [1] § 2.2 WHAT DO ALL ACIDS AND ALL BASES HAVE IN COMMON?
Four solutions, namely glucose, alcohol, hydrochloric acid and sulphuric acid filled in four separate beakers are connected one by one in an electric circuit with a bulb. The solutions in which the bulb will glow when current is passed are :
- A Glucose and alcohol
- B Alcohol and hydrochloric acid
- C Glucose and sulphuric acid
- D Hydrochloric acid and sulphuric acid
Previously asked in CBSE board exam
2024 31/4/1 Q3
Generated by claude-sonnet-4-6 · 2026-06-15 06:44 · grounding rag
Model Answer
Option D: Hydrochloric acid and sulphuric acid.
Acids produce H⁺(aq) ions in solution, which carry electric current and make the bulb glow. Glucose and alcohol do not ionise, so they do not conduct electricity.
Source: Chapter 2, Section 2.2 (Activity 2.8)
Explanation
The key concept is ionic conduction: only solutions containing ions can conduct electricity. HCl and H₂SO₄ are strong acids that fully dissociate into ions in water. Glucose and alcohol contain hydrogen but do not produce H⁺ ions in solution, so they are non-electrolytes. Examiners expect you to link "glowing bulb = ions present = acid/base" directly.
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