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Manipal MET2015ChemistryClassification of Elements and Periodicity in Properties

In which of the following arrangement the order is not according to the property indicated against it?

Options

  1. ALi Na K Rb (increasing metallic radius)
  2. B1 Br F Cl (increasing electron gain enthalpy, with negative sign)
  3. CB C N O (increasing . first ionisation enthalpy)
  4. DAl ³⁺ Mg ²⁺ Na ⁺ F ⁻ (increasing ionic size)

Correct answer

C. B C N O (increasing . first ionisation enthalpy)

Step-by-step solution

(a) Metallic radii increase in a group from top to bottom. Thus, Li Na K Rb is true. (b) Electron gain enthalpy of Cl F and afterwards it decreases along a group. (c) Ionisation enthalpy increase along a period left to right but due to presence of half-filled orbital in N , ionisation enthalpy of N O . Thus B C N O is incorrect. (d) For isoelectronic species, ionic size 1 atomic number Thus , Al ³⁺ Mg ²⁺ Na ⁺ F ⁻ is true.

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