Observation based questions - Practical chemistry - ICSE - IMPORTANT for VIVA

IDENTIFICATION OF GASES

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1. Name a gas which is neutral in nature and burns with blue flame.

Ans: Hydrogen gas

2. Name the gas which turns lime water milky but has no effect of acidified Potassium permanganate and acidified Potassium dichromate.

Ans: Carbon dioxide gas

3. The gas, which is greenish yellow in colour, turns moist blue litnus paper to red and then bleaches it.

Ans: Chlorine gas.

4. A which is released by the oxidation of Conc. HCl using an oxidizing agent.

Ans: Chlorine gas

5. A basic gas which is used in the manufacturing of a fertilizer called Urea.

Ans: Ammonia gas

6. These vapours turn anhydrous Copper sulphate to blue.

Ans: Water vapour

7. A suffocating gas which turns lime water milky and highly soluble in water.

Ans: Sulphur dioxide gas.

8. This gas is released when Sodium chloride (mineral) is heated with a non-volatile acid.

Ans: Hydrogen chloride gas

9. A coloured gas which gives Iodine vapours with Potassium iodide crystals.

Ans: Nitrogen dioxide

10. A gas which is released when a dilute acid reacts with a metal sulphide.

Ans: Hydrogen sulphide