Assertion :Nylon wire is stronger than steel wire. Reason: Nylon is a fibre while steel is an alloy.

Both assertion and reason are correct and reason is the correct explanation for assertion

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Both assertion and reason are correct but reason is not the correct explanation for assertion

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Assertion is correct but reason is incorrect

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Both assertion and reason are incorrect

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Solution

The correct option is B Both assertion and reason are correct but reason is not the correct explanation for assertion
Steel is an alloy. Nylon is a polymer (synthetic fibre). It is a polyamide. The amide linkage between the monomers makes nylon fibres very strong. Hence, Nylon wire is stronger than steel wire.
Thus, Both assertion and reason are correct but the reason is not the correct explanation for assertion

Hence, the correct option is $B$

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