The increasing order of the first ionisation enthalpies of the elements B,P,S and F is
F < S < P < B
P < S < B < F
B < P < S < F
B < S < P < F
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+
In which of the following pairs does one elements exist as a solid and the other as a liquid under normal conditions ?
I2 and F2
I2 and Br2
Br2 and Hg
Na and Cs
Chloride ion and potassium ion are isoelectronic then
their sizes are same
Cl- ion is bigger than K+ ion
K+ ion is relatively bigger
their sizes depend on other cation and anion
Which among the following factors is the most important in making fluorine the strongest oxidising agent?
Electron affinity
Ionisation enthalpy
Hydration enthalpy
Bond dissociation energy
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+
The ionic mobility of alkali metal ions in aqueous solution is maximum for
K+
Rb+
Li+
Na+
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
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+
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
