CBSE
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
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+
The 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
Which of the following elements can be involved in bonding?
Carbon
Nitrogen
Phosphorus
Boron
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
Among the following the molecule possessing highest dipole moment is
CO2
BF3
SO2
Trans-2-butene
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
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
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
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-