The correct sequence which shows decreasing order of the ionic radii of the elements is
Al3+ > Mg2+ > Na+ > F - > O2-
Na+ > Mg2+ > Al3+ > O2- > F -
Na+ > F - > Mg2+ > O2- > Al3+
O2- > F - > Na+ > Mg2+ > Al3+
The atomic numbers of vanadium (V), chromium (Cr), manganese (Mn) and iron (Fe) are respectively 23,24,25 and 26. Which one of these may be expected to have the highest second ionisation enthalpy?
V
Cr
Mn
Fe
Ce3+, La3+, Pm3+ and Yb3+ have ionic radii in the increasing order as
La3+ < Ce3+ < Pm3+ < Yb3+
Yb3+ < Pm3+ < Ce3+ >La3+
La3+ = Ce3+ < Pm3+ < Yb3+
Yb3+ < Pm3+ < La3+ < Ce3+
Which one of the following is smallest in size ?
N3-
O2-
F -
Na+
In which of the following arrangements, the order is not according to the property indicated against it?
Li < Na < K < Rb : increasing metallic radius
I < Br < F < Cl : increasing electron gain enthalpy (with negative sign)
B < C < N < O : increasing first ionisation enthalpy
Al3+ < Mg2+ < Na+ < F - : increasing ionic size
Which of the following electronic configurations would exhibit the lowest ionisation energy ?
1s2
1s2,2s2 2p2
1s2,2s2 2p6
1s2,2s2 2p6,3s1
Identify the correct order of solubility in aqueous medium
CuS > ZnS > Na2S
ZnS > Na2S > CuS
Na2S > CuS > ZnS
Na2S > ZnS > CuS
An extra electron is added at the periphery of nitrogen atom in the formation of anion. What will be the ratio of effective nuclear charge of nitrogen atom and nitrogen anion?
2.09 : 1
0.09 : 1
3.09 : 1
1.09 : 1
Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point?
RbCl
KCl
NaCl
LiCl
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+?
Mg2+ < Be2+ < K+ < Ca2+
Be2+ < K+ < Ca2+ < Mg2+
K+ < Ca2+ < Mg2+ < Be2+
Ca2+ < Mg2+ < Be2+ < K+
