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KCET2014ChemistrySome Basic Concepts of Chemistry

For the properties mentioned, the correct trend for the different species is in

Options

  1. Ainert pair effect ( -A l>G a>I n )
  2. Bfirst ionization enthalpy ( -B>A l>T l )
  3. Cstrength as Lewis acid - ( BCl ₃> AlCl ₃> GaCl ₃ )
  4. Doxidizing property ( -A l³⁺>I n³⁺>T l³⁺ )

Correct answer

C. strength as Lewis acid - ( BCl ₃> AlCl ₃> GaCl ₃ )

Step-by-step solution

Lewis acid strength decreases down the group therefore, order is BCl ₃> Al Cl ₃> GaCl ₃ First ionization energy for Group 13 elements decreases down the group till Al then increases for Ga due to d-electron contraction, decrease for In then again increases for TI due to lanthanoid contraction, that is, B > Tl > Ga > Al > In . Inert pair effect shown by heavier elements only, therefore, for Tl , +1 oxidation states in more stable and it strong oxidizing agent in +3 states.

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