Which of the following statements are correct ?
(i) Aluminium forms $${\left[ {Al{F_6}} \right]^{3 - }}ion$$ while boron forms only $${\left[ {B{F_4}} \right]^ - }\,ion$$ due to presence of $$d$$ - orbitals in aluminium.
(ii) The first member of a group differs from the heavier members in its ability to form $$p\pi {\text{ - }}p\pi $$ multiple bonds to itself and to other second row elements. While heavier member forms $$d\pi {\text{ - }}p\pi $$ bonds.
(iii) $$d$$ - orbitals contribute more to the overall stability of molecules than $$p\pi {\text{ - }}p\pi $$ bonding of second row elements.
A.
(i) (ii) (iii)
B.
(i) (iii)
C.
(i) (ii)
D.
(ii) (iii)
Answer :
(i) (ii)
Solution :
$$d$$ - orbitals are of higher energy than the $$p$$ - orbitals, they contribute less to the overall stability of molecules than $$p\pi {\text{ - }}p\pi $$ bonding of the second row elements.
Releted MCQ Question on Inorganic Chemistry >> P - Block Elements
Releted Question 1
The reddish brown coloured gas formed when nitric oxide is oxidised by air is