Statement I: Two electrons in the $2 s$ subshell must have opposite spins because :
Statement II: The Pauli exclusion principle states that no two electrons in the same atom can have identical quantum numbers.

Both statement 1 and statement 2 are correct and statement 2 is the correct explanation for statement 1

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Both statement 1 and statement 2 are correct but statement 2 is NOT the correct explanation for statement 1

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Statement 1 is correct but statement 2 is incorrect

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Statement 1 is incorrect but statement 2 is correct

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Both statement 1 and statement 2 are incorrect

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Solution

The correct option is A
Both statement 1 and statement 2 are correct and statement 2 is the correct explanation for statement 1

According to Pauli's exclusion principle, no two electrons in an atom can have all 4 quantum numbers identical.
As $2 s$ sub-shell have same $n, l, m$ therefore $s$ must be different.

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Statement I: Two electrons in the 2s subshell must have opposite spins because :Statement II: The Pauli exclusion principle states that no two electrons in the same atom can have identical quantum numbers.

Statement I: Two electrons in the $2 s$ subshell must have opposite spins because :
Statement II: The Pauli exclusion principle states that no two electrons in the same atom can have identical quantum numbers.