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NEET UG CHEMISTRY MCQ: 13 TH GROUP ELEMENTS (P-BLOCK)
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Medium
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Analyzing
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Assertion: Electronegativity first increases from B to Al and then decreases from Al to .
Reason: Due to poor shielding by inner and electrons.
Reason: Due to poor shielding by inner and electrons.
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Correct option: D
Assertion is false, but Reason is true
Option D (Assertion is false, but Reason is true) is correct because electronegativity generally decreases down the group due to increasing atomic size and shielding, and the poor shielding by inner d and f electrons is a valid reason for irregularities.
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