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JEE Main Chemistry question

ChemistryClassification of Elements and Periodicity in PropertiesJEE Main

The correct order of decreasing first ionisation energy is [RPET 2010]

Answer: (B)

Solution

Approximate values (kJ/mol): C = 1086, Be = 899, B = 801, Li = 520. Although ionisation energy generally rises across a period, Be's completely filled subshell gives it extra stability, pushing its IE

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Question ID VK-133175