Acids, Bases and Salts

Samacheer Book Back Questions And Answers For Science Standard 9 “Acids, Bases and Salts“

I. Choose the correct answer:
1. Zn + 2 HCl → ZnCl₂ + _____↑
a. H₂
b. O₂
c. CO₂

2. Apple contains malic acid. Orange contains _____.
a. citric acid
b. ascorbic acid

3. Acids in plants and animals are organic acids. Whereas Acids in rocks and minerals are _____.
a. Inorganic acids
b. Weak acids

4. Acids turn blue litmus paper to _____
a. Green
b. Red
c. Orange

5. Since metal carbonate and metal bicarbonate are basic, they react with acids to give salt and water with the liberation of _____.
a. NO₂
b. SO₂
c. CO₂

6. The hydrated salt of copper sulphate has _____ colour.
a. Red
b. White
c. Blue

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