NEET Chemistry Periodic Trends Assertion Reason Question
Assertion (A): Electronegativity decreases down a group in the periodic table.
Reason (R): The decrease in electronegativity down a group is due to an increase in atomic size, which reduces the effective nuclear charge experienced by valence electrons.
Both A and R are true, and R is the correct explanation of A.
Both A and R are true, but R is not the correct explanation of A.
A is true, but R is false.
A is false.
Correct Answer
Detailed Explanation
Electronegativity decreases down a group because the atomic size increases, leading to a reduced effective nuclear charge on valence electrons. This is supported by the NCERT context on periodic trends in electronegativity.
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