Question

the gas obtained by the thermal decomposition of limestone is not released during respiration burning of coal, burning of natural gas, thermal decomposition of ferrous sulphate
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Answer 1

Answer:

1. Burning of natural gas

2. Photosynthesis 

3. Electrolysis of water

4. Respiration

5. Decomposition of calcium carbonate

Answer 2

Same gas (CO2) is obtained in thermal decomposition of limestone, burning of coal and burning of natural gas.

• There are four scenarios mentioned in the question, where chemical reaction happens and different gases are evolved.
• In the thermal decomposition of limestone, the carbon dioxide gas is produced.

CaCO3 ---> CaO + CO2

• In the burning of coal, and in the buring of natural gas, the carbon dioxide gas is also produced due to the combustion reaction.
• But, in the thermal decomposition of ferrous sulphate, the scenario is different. Here, sulpher dioxide and sulpher trioxide gases are produced.

2FeSO4 ---> Fe2O3 + SO2 + SO3