CBSE Class 10 Science 2021 Term 1 Solved Paper

Direction for Question No. 31- 35

It consists of two statements - Assertion (A) and Reason (R). Answer these questions selecting the appropriate options given below:

Question : 32

Total: 60

Assertion (A): Burning of Natural gas is an endothermic process.
Reason (R): Methane gas combines with oxygen to produce carbon dioxide and water.

Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are true but (R) is not the correct explanation of (A).
(A) is true, but (R) is false.
(A) is false, but (R) is true.

Solution:

When methane, CH4 (natural gas) is burned in the presence of oxygen, it forms carbon dioxide, water, along with the evolution of heat. Since, burning of natural gas is accompanied with the evolution of heat, it is called as an exothermic reaction.
CH4+2O2→CO2+2H2O+‌ Energy ‌

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