Multiple Choice QuestionsStability of the species Li2, Li2− and Li2+ increases in the order of:
Li2 < Li2+ < Li2-
Li2− < Li2+ < Li2
Li2< Li2− < Li2+
Li2< Li2− < Li2+
In which of the following pairs the two species are not isostructural?
CO32- and NO3-
PCl+4 and SiCl4
PF5 and BrF5
PF5 and BrF5
Among the following, the maximum covalent character is shown by the compound
FeCl2
SnCl2
AlCl3
AlCl3
C.
AlCl3
The covalent character in ionic compounds is governed by Fazanís Rule.
(i) larger the charge on the ions.
(ii) smaller the size of anions.
(iii) larger the size of anion.
(iv) larger the polarizing power larger the covalent character.
AlCl3 will show Maximum covalent character on account of the higher polarising power of Al3+ because of its having higher positive charge and smaller size.
The hybridization of orbitals of N atom in NO3-, NO2+ and NH4+ are respectively
sp, sp2,sp3
sp2 , sp, sp
sp, sp3 , sp2
sp, sp3 , sp2
The group having isoelectronic species is
O2– , F–, Na+ , Mg2+
O– , F–, Na, Mg+
O2–, F–, Na ,Mg2+
O2–, F–, Na ,Mg2+
Using MO theory predict which of the following species has the shortest bond length?
O22+
O2+
O2−
O2−
The bond dissociation energy of B–F in BF3 is 646 kJ 1 mol− whereas that of C-F in CF4 is 515 kJ 1 mol−.The correct reason for higher B-F bond dissociation energy as compared to that of C-F is
Smaller size of B-atom as compared to that of C- atom
Stronger σ bond between B and F in BF3 as compared to that between C and F in CF4
Significant pπ - pπ interaction between B and F in BF whereas there is no possibility of such 3 interaction between C and F in CF4
Significant pπ - pπ interaction between B and F in BF whereas there is no possibility of such 3 interaction between C and F in CF4
Which one of the following pairs of species has the same bond order?
CN− and NO+
CN− and CN+
O2− and CN−
O2− and CN−
Which of the following hydrogen bonds is the strongest?
O – H …… N
F – H …… F
O – H ….. O
O – H ….. O
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