Which one of the following is correct order of increase of size ?
Mg <Al< Na+ < F -
Na+ < Al < Mg < F -
Na+ < F - < Al < Mg
Na+ < F - < Mg < Al
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
Which element was named as Eka-silicon in Mendeleev's classification of elements ?
Germanium
Gallium
Thallium
Selenium
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+
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
Ionisation potential and electron affinity of fluorine are 17.42 and 3.45 eV respectively. What will be the ratio of electronegativity of fluorine on Mulliken scale and Pauling scale?
2.80 : 1
1.80 : 1
2.40 : 1
4.20 : 1
The set representing the correct order of ionic radius is
Li+ > Be2+ > Na+ > Mg2+
Na+ > Li+ > Mg2+ > Be2+
Li2+ > Na+ > Mg2+ > Be2+
Mg2+ > Be2+ > Li+ > Na+
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 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
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
