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.

Question

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 otpions given below :

(A) A and C only
(B) A and D only
(C) C and D only
(D) B and D only

Prashant Kotian · Accepted Answer

Correct answer: C. (A) B +3 < Al +3 < Ga +3 < In +3 < Tl +3 : ionic size (B) B > Tl > In > Ga > Al : EN (C) B > Tl > Ga > Al > In : IE (D) Trichlorides and triiodides of group 13 th elements are covalent in nature

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