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+
The statement that is not correct for the periodic classification of elements is
the properties of the elements are the periodic function of their atomic number
non-metallic elements are lesser in number than metallic elements
the first ionisation energies of elements along a period do not vary in a regular manner with increase in atomic number
for transition elements, the d-subshells are filled with electrons monotonically with increase in atomic numbers
Which one of the following is smallest in size ?
N3-
O2-
F -
Na+
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
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
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
The ionic mobility of alkali metal ions in aqueous solution is maximum for
K+
Rb+
Li+
Which element was named as Eka-silicon in Mendeleev's classification of elements?
Germanium
Gallium
Thallium
Selenium
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