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
Which one of the following is smallest in size ?
N3-
O2-
F -
Na+
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
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+
Which of the following electronic configurations would exhibit the lowest ionisation energy ?
1s2
1s2,2s2 2p2
1s2,2s2 2p6
1s2,2s2 2p6,3s1
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
The ionic mobility of alkali metal ions in aqueous solution is maximum for
K+
Rb+
Li+
