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JEE Main202313 Apr 2023Evening ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

. Identify the correct order of standard enthalpy of formation of sodium halides.

Options

  1. ANaI   <   NaBr   <   NaF   <   NaCl
  2. BNaI   <   NaBr   <   NaCl   <   NaF
  3. CNaF   <   NaCl   <   NaBr   <   NaI
  4. DNaCl   <   NaF   <   NaBr   <   NaI

Correct answer

B. NaI   <   NaBr   <   NaCl   <   NaF

Step-by-step solution

The lattice energy of an ionic compound is the energy required to separate one mole of the compound into its constituent ions in the gas phase. Lattice energy ∝ 1 r + + r - The lattice energy is inversely proportional to the sum of the ionic radii r + + r - of the ions involved. When the size of the ions increases, the distance between them also increases, leading to a decrease in the attractive forces between the ions and a decrease in the lattice energy. Therefore, if the size of the ions increases, the lat

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