[ ] Reason (R) Assertion (A): A nylon thread is stronger than steel wire. A steel thread can support more weight than nylon 3) Both A and R are true and R is the correct explanation of A b) Both A and R are true and R is not correct explanation of A c) A is correct and R is incorrect d) A is incorrect and R is correct.
Answers
Answer:
option b is correct
Hint:To solve assertion reasons, type of problems always look at the assertion first, without looking at the reason, read the assertion, and think of its reason in your own mind. Then look at the reason. If you find that your reason matches with the reason in question, mark it A. if the reason is incorrect then option A and B will not be the answer. So, find the probability of the most suitable option.
Complete step-by-step answer:Let us look at only Assertion first. It states that Nylon wire is stronger than steel wire. Let us discuss it.
We know that nylon is a polyamide, and its monomers are adipic acid and hexamethylenediamine, which are held together by very strong amide linkages.
We should remember that an amide linkage is very rigid. The carbonyl oxygen and amide hydrogen carry a partial negative and partial positive charge, respectively, which allows each of them to form a hydrogen bond. And we know that in any substance if hydrogen bond is present, that substance is rigid and strong.
This is the reason that the Nylon wire due to presence of strong amide linkage and hydrogen bond is much stronger than the steel wire, which lacks both of them.
Till now, we have understood that the assertion is completely correct and we have discussed the reason for the same.
Now, let us look at the reason, it states that Nylon is a fiber while steel is an alloy.
The given statement of reason is correct because we know that steel is an alloy of iron and carbon and that nylon is a fiber.
But this reason does not match with the actual and accurate reason that we discussed.
Thus, we infer that though both the assertion and reason are correct, the reason is not the correct explanation of assertion.
Hence, the correct option is B.
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