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AP EAMCET202124 Aug 2021Evening ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

Identify the incorrect order corresponding the mentioned property.

Options

  1. AAl ₂ O ₃ < MgO < Na ₂ O < K ₂ O : Basicity
  2. BNH ₃ < PH ₃ < AsH ₃: Acidity
  3. CLi ⁺ < Na ⁺ < K ⁺ < Cs ⁺ : lonic radius
  4. DLi < Be < B < C : First ionisation enthalpy

Correct answer

D. Li < Be < B < C : First ionisation enthalpy

Step-by-step solution

The first ionisation energy generally increases as we move from left to right across a period. This is due to increasing nuclear charge which results in the strong attraction of outermost electron to the nucleus. So, the correct trend of first ionisation enthalpy is Li < Be < B < C

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