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jee_main_2025_29_jan_morning - Classification of Elements and Periodicity in Properties Topics

Master these core formulas and structures to solve almost any past paper question.

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QUESTION #42 Periodic Trends in Properties
An element 'E' has the ionisation enthalpy value of 374 \, mathrmkJ \, mol^-1 . 'E' reacts with elements A, B, C and D with electron gain enthalpy values of -328 , -349 , -325 and -295 \, mathrmkJ \, mol^-1 , respectively. The correct order of the products EA, EB, EC and ED in terms of ionic character is :
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QUESTION #45 Periodic Trends in Physical and Chemical Properties
Given below are two statements : Statement (I) : The radii of isoelectronic species increases in the order: mathrm M g ^ 2 + < mathrm N a ^ + < mathrm F ^ - < mathrm O ^ 2 - Statement (II) : The magnitude of electron gain enthalpy of halogen decreases in the order: mathrm C l > mathrm F > mathrm B r > mathrm I
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