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ICSE Class 10 Chemistry Question 9 of 23

Solved Sample Paper 1 — Question 16

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Question 2(i)

The diagram shows an experimental set up for the laboratory preparation of a gas known as marsh gas. It is also present in the air exhaled by animals whose food contain cellulose. Study the diagram and answer the following.

The diagram shows an experimental set up for the laboratory preparation of a gas known as marsh gas. It is also present in the air exhaled by animals whose food contain cellulose. Chemistry Sample Paper Solved ICSE Class 10.

(a) Name the gas collected in the jar.

(b) Write a balanced chemical equation for the above preparation. How is the gas being collected?

(c) Name the type of reaction taking place in this. Why this particular reaction is taking place in this?

Answer

(a) Methane [CH4]

(b)

CH3COONasodium acetate+NaOHsodalime→ΔCaOCH4methane+Na2CO3\underset{\text{sodium acetate}}{\text{CH}_3\text{COONa}} + \underset{\text{sodalime}}{\text{NaOH}} \xrightarrow[\Delta]{\text{CaO}} \underset{\text{methane}}{\text{CH}_4} + \text{Na}_2\text{CO}_3

The gas is collected by downward displacement of water.

(c) Decarboxylation reaction takes place. It happens due to elimination of a molecule of CO2 from a carboxylic acid. In this reaction, CO2 is removed as a carbonate.