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NEET2025ChemistryClassification of Elements and Periodicity in PropertiesActual

Which of the following statements are true? A. Unlike Ga that has a very high melting point, Cs has a very low melting point. B. On Pauling scale, the electronegativity values of N and Cl are not the same. C. Ar , K ⁺, Cl ⁻, Ca ²⁺ , and S ²⁻ are all isoelectronic species. D. The correct order of the first ionization enthalpies of Na , Mg , Al , and Si is Si Al Mg Na . E. The atomic radius of Cs is greater than that o

Options

  1. AA, B and E only
  2. BC and E only
  3. CC and D only
  4. DA, C and E only

Correct answer

B. C and E only

Step-by-step solution

(C) Ca ²⁺, K ⁺, Ar , Cl ⁻, S ²⁻ all species have 18 electrons that's why these are isoelectronic species. (E) Radius order Cs Rb K Na Li

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