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The correct statements from the following are : (A) Ionic radii of trivalent cations of group 13 elements decreases down the group. (B) Electronegativity of group 13 elements decreases down the group. (C) Among the group 13 elements, Boron has highest first ionisation enthalpy. (D) The trichloride and triiodide of group 13 elements are covalent in nature. Choose the correct answer from the options given below :

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

Correct answer: C and D only

Solution

Option C is correct because Boron, being the smallest element in group 13, has the highest first ionization enthalpy due to its strong nuclear charge and small size. Option D is also correct as the trichlorides and triiodides of group 13 elements exhibit covalent character due to their molecular structures and the nature of bonding.

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