ICSE CHEMISTRY CLASS 10 - SULPHURIC ACID - OBSERVATION BASED QUESTIONS

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State your one appropriate observation in each of the following cases:

1. Conc. Sulphuric acid is added to Sugar crystals

Ans: It leaves a black spongy mass.

2. Conc. Sulphuric acid is added to Copper sulphate crystals

Ans: Blue colour of the Copper sulphate and becomes amorphous.

3. Dilute Sulphuric acid is added to Barium chloride solution.

Ans: A white precipitate is formed.

4. Conc. Sulphuric acid is heated with Sodium chloride.

Ans: A colourless gas with pungent odour released. The gas gives white dense fumes with a glass rod dipped in Ammonia solutions.

5. Dilute Sulphuric acid is added to Sodium carbonate.

Ans: Brisk effervescence of a colourless gas. That gas turns lime water milky and decolourizes acidified Potassium permanganate.

6. Dilute Sulphuric acid is added to Zinc sulphide.

Ans: A colourless gas with rotten egg smell. That gas turns Lead acetate paper to Silvery black.

7. Dilute Sulphuric acid is added to Copper oxide.

Ans: A blue solution is formed.

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