Question

Assertion: Oxygen is an element.
Reason: It cannot be decomposed by a physical or a chemical process.

Answer 1

Answer:

both are true but r not the correct explanation for a

Answer 2

Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

• Oxygen is an element. It is a non-metal with the atomic number 8. Predominantly in the gaseous state, oxygen is significant to the processes of combustion and respiration.
• Since there is no doubt about the fact that oxygen is, in fact, an element, assertion A is true.
• Elements consist of a homogenous group of atoms of the same element. These groups can be broken down into smaller and even smaller groups until we reach the last atom, but it still retains its nature as an element. Hence, an element cannot be broken down into other substances by any physical or chemical process.
• Chemical reactions can be used to combine an element with another, most definitely, but they cannot be used to separate an element into other elements. For instance, the chemical process of combustion combines oxygen with carbon, but it cannot separate oxygen from oxygen to form some other substance.
• Hence, the reason R is true and can be considered as the explanation of assertion A since the fact that oxygen is an element can be validated by the fact that it cannot be broken down into other substances.
• So, A and R are true, and R is the correct explanation of A.

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