Which one of the following is smallest in size ?
N3-
O2-
F -
Na+
The charge/size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizing 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+
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 ionic mobility of alkali metal ions in aqueous solution is maximum for
K+
Rb+
Li+
Which one of the following is correct order of increase of size ?
Mg + < F -
Na+ < Al < Mg < F -
Na+ < F - < Al < Mg
Na+ < F - < Mg < Al
Which element was named as Eka-silicon in Mendeleev's classification of elements?
Germanium
Gallium
Thallium
Selenium
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
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
Ionization potential and electron affinity of fluorine are 17.42 and 3.45 eV respectively. What will be the ratio of electronegativity of fluorine on Mullikan scale and Pauling scale?
2.80 : 1
1.80 : 1
2.40 : 1
4.20 : 1
