CBSE
Multiple Choice QuestionsThe angular shape of ozone molecule (O3) consists of
1 sigma and 2 pi bonds
2 sigma and 2 pi bonds
1 sigma and 1 pi bonds
2 sigma and 1 pi bonds
The charge/size ratio of a cation determines its polarising power. Which one of the following sequences represents the increasing order of the polarising power of the cationic species, K+, Ca2+, Mg2+, Be2+?
K+ < Ca2+ < Mg2+ < Be2+
Be2+ < K2+ < Ca2+ < Mg2+
Mg2+< Be2+ < K+ < Ca2+
Ca2+ < Mg2+ < Be+ < K+
Which of the following represents the correct order of decreasing number of S = O bonds?
H2SO4 > H2SO3 > H2S2O8
H2S2O8 > H2SO3 > H2SO4
H2S2O8 > H2SO4 > H2SO3
H2SO3 > H2S2O8 > H2SO4
Consider the following structures
Choose the correct statement regarding the above structures.
Dipole moment varies as II > III > I
II is more stable than I
I is the most reactive among three
All of the above
The correct order of basic strength of the following are
I > II > IV > III
IV > III > II > I
II > III > IV I
III > IV > II > I
In the complexes [Fe(H2O)6]3+ , [Fe(CN)6]3-, [Fe(C2O4)3]3- and [FeCl6]3-, more stability is
[FeCl6]3-
[Fe(C2O4)3]3-
[Fe(H2O)6]3+
[Fe(CN)6]3-
The correct order of magnitude of bond angles among the compounds CH4, NH3 and H2O is
CH4 > H2O < NH3
H2O < NH3 < CH4
NH3 < CH4 < H2O
NH3 < H2O < CH4
Which of the following elements can be involved in bonding?
Carbon
Nitrogen
Phosphorus
Boron
Among the following the molecule possessing highest dipole moment is
CO2
BF3
SO2
Trans-2-butene
The standard enthalpies of formation of A(NH3), B(CO2), C(HI) and D(SO2) are - 46.19, -393.4, +24.94 and -296.9 kJ mol1 respectively. The increasing order of their
stability is
B < D < A < C
C < A < D < B
D < B < C < A
A < C < D < B
