The correct statements from the following are:

(A) The decreasing order of atomic radii of group 13 elements is .

(B) Down the group 13 electronegativity decreases from top to bottom.

(C) Al dissol

Question

The correct statements from the following are:

(A) The decreasing order of atomic radii of group 13 elements is .

(B) Down the group 13 electronegativity decreases from top to bottom.

(C) Al dissolves in dil. HCl and liberates  but conc.  renders Al passive by forming a protective oxide layer on the surface.

(D) All elements of group 13 exhibits highly stable +1 oxidation state.

(E) Hybridisation of Al in  ion is .

Choose the correct answer from the options given below:

Canvas Classes · Accepted Answer

Analysis:

(A) TRUE — Atomic radii order: Tl  In  Ga  Al  B. Note: Ga has a slightly smaller radius than Al due to d-orbital contraction, but the overall order given is correct. ✓

(B) FALSE — Electronegativity does NOT decrease uniformly down Group 13. Ga has higher electronegativity than Al due to d-orbital contraction. The trend is irregular. ✗

(C) TRUE — Al + dil. HCl →  ✓; Conc.  passivates Al by forming a thin  layer. ✓

(D) FALSE — Only Tl shows highly stable +1 state. For Al and Ga, +1

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