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AP EAMCET2006ChemistryThermodynamics (C)

A B is an ionic solid. The ionic radii of A⁺ and B⁻ are respectively r_c and r_a . Lattice energy of A B is proportional to :

Options

  1. Ar_c r_a
  2. B(r_c+r_a )
  3. Cr_a r_c
  4. D1 (r_c+r_a )

Correct answer

D. 1 (r_c+r_a )

Step-by-step solution

The lattice becomes stronger (i.e., the lattice energy U becomes more negative), as r the inter ionic distance decreases. U is proportional to 1 r or U 1 (r_c+r_a )

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