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ExamsJEE MainChemistry

The correct orders among the following are Atomic radius : B < Al < Ga < In < Tl Electronegativity : Al < Ga < In < Tl < B Density : Tl < In < Ga < Al < B 1st Ionisation energy : In < Al < Ga < Tl < B Choose the correct answer from the options given below :

  1. C and D only
  2. A and B only
  3. B and D only
  4. A and C only

Correct answer: B and D only

Solution

The order of atomic radius is accurate as it reflects the increasing size of atoms down the group, while the electronegativity order correctly shows the trend of increasing ability to attract electrons from left to right across the period. The other two orders regarding density and ionization energy are incorrect, confirming that only options B and D are valid.

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