(A) Molecular mass of polymers is always expressed as an average.
(R) Generally, a polymer sample contains chains of varying lengths.

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

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are false

(A) is true but (R) is false

answer is A.

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Detailed Solution

Polymers are large molecules formed by joining small repeating units called monomers.
A polymer sample typically contains chains of varying lengths.
Therefore, the molecular mass of polymers is always expressed as an average.
The reason for this is that a polymer sample contains chains of different lengths, and each chain contributes to the overall molecular mass of the sample.
Since the number of chains of each length can vary, the molecular mass of the sample will be an average of the molecular masses of all the chains present.
Therefore, both Assertion (A) and Reason (R) are true, and Reason (R) correctly explains Assertion (A).

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