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Acids, Bases and Salts
Science · CBSE Class 10 · English Medium · 21 questions and answers
Sample questions
- Q: What are acids? Give two examples.
- A: Substances that turn blue litmus red and produce H⁺ (H₃O⁺) ions in aqueous solution. Examples: HCl, H₂SO₄.
- Q: What are bases?
- A: Substances that turn red litmus blue and produce OH⁻ ions in aqueous solution; water-soluble bases are called alkalis.
- Q: What are indicators? Name two natural indicators.
- A: Substances that show a change in colour or smell in acids and bases. Natural indicators: litmus and turmeric (also red cabbage).
- Q: What are olfactory indicators?
- A: Substances whose odour changes in acidic or basic media, e.g. onion and vanilla essence.
- Q: What gas is produced when an acid reacts with a metal?
- A: Hydrogen gas, which burns with a 'pop' sound when a lighted matchstick is brought near it.
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