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Solution


Q.

The correct statements from the following are:                                      [2026]

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 the 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 D only  
2 B and D only  
3 A and C only  
4 C and D only  

Ans.

(4)

(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 13th elements are covalent in nature