Question

The correct statements from the following are : 

(A) The decreasing order of atomic radii of group 13 elements is Tl > In > Ga > Al > B. 

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

(C) Al dissolves in dil. HCl and liberate \(H_2\) but conc. \(HNO_3\) 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 \([Al (H_2 O)_6] ^{3+} ion\) is \(sp^3 d^2.\)

Choose the correct answer from the options given below : 

(1) (C) and (E) only 

(2) (A), (C) and (E) only 

(3) (A), (B), (C) and (E) only 

(4) (A) and (C) only

Answer 1

Correct option is (1) (C) and (E) only 

A. size order Tl > In > Al > Ga > B

B. Electronegativity order B > Al < Ga < In < Tl

D. B, Al are more stable in +3 oxidation state

So, only C, E statements are correct.