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COMEDK20269 May 2026Evening ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

Which of the following is an INCORRECT match?

Options

  1. AElectron Gain enthalpy - F Br > I
  2. BMetallic character - Al > Mg > B > K
  3. CFirst Ionization Enthalpies - Na Al < Si
  4. DIonic size - Na ^+ > Mg ⁺² > Al ⁺³ > Si ⁺⁴

Correct answer

B. Metallic character - Al > Mg > B > K

Step-by-step solution

Metallic character increases down a group and decreases from left to right across a period. Potassium ( K ) is an alkali metal in group 1 and period 4, making it the most metallic among the given elements. Boron ( B ) is a metalloid in group 13 and period 2, making it the least metallic. Magnesium ( Mg ) and Aluminum ( Al ) belong to period 3. Since Mg is in group 2 and Al is in group 13, Mg is more metallic than Al . The correct order of metallic character is K > Mg > Al > B . The given order Al > Mg > B > K is in

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