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Assertion : Dihydrogen exhibits nuclear ...

Assertion : Dihydrogen exhibits nuclear spin isomerism.
Reason : The two electrons present in a `H_(2)` molecule always spin in the opposite direction

A

If both Assertion and Reason are CORRECT and Reason is the CORRECT explanation of the Assertion.

B

If both Assertion and Reason are CORRECT but Reason is not the CORRECT explanation of the Assertion.

C

If Assertion is CORRECT but Reason is INCORRECT.

D

If Assertion is INCORRECT but Reason is CORRECT.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the assertion-reason question regarding dihydrogen and nuclear spin isomerism, we will analyze both the assertion and the reason step by step. ### Step 1: Understand the Assertion The assertion states that "Dihydrogen exhibits nuclear spin isomerism." - Nuclear spin isomerism refers to the existence of different isomers that arise from the different orientations of nuclear spins in a molecule. In dihydrogen (H₂), which consists of two protons, there are two possible configurations for their spins: 1. **Para-hydrogen**: Both protons have their spins aligned anti-parallel (opposite directions). 2. **Ortho-hydrogen**: Both protons have their spins aligned parallel (same direction). ### Step 2: Understand the Reason The reason states that "The two electrons present in a H₂ molecule always spin in the opposite direction." - This statement refers to the Pauli Exclusion Principle, which states that no two electrons can occupy the same quantum state simultaneously, and thus they must have opposite spins. However, dihydrogen consists of two protons, not electrons. ### Step 3: Evaluate the Assertion and Reason - The assertion is **correct** because dihydrogen does exhibit nuclear spin isomerism with the two forms (ortho and para). - The reason is **partially correct** in that it correctly describes the behavior of electrons according to the Pauli Exclusion Principle, but it is **incorrect** in the context of the assertion because it discusses electron spins instead of proton spins. ### Conclusion - The assertion is true, and the reason is true, but the reason does not correctly explain the assertion. Therefore, the correct answer is that the assertion is correct, but the reason is not the correct explanation. ### Final Answer - **Assertion**: True - **Reason**: True (but not a correct explanation) - **Conclusion**: Assertion is correct, reason is correct, but does not explain the assertion.
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