Multiple Choice QuestionsWhich of the following pairs has the same size?
Fe2+ , Ni2+
Zr4+, Ti4+
Zr4+, Hf4+
Zr4+, Hf4+
Which one of the following ion has electronic configuration [Ar] 3d6?
(At. no: Mn = 25, Fe = 26, Co = 27, Ni = 28)
Ni3+
Mn
Fe3+
Fe3+
Among the elements Ca, Mg, P and Cl, the order of increasing atomic radii is
Mg< Ca < Cl < P
Cl < P < Mg < Ca
P < Cl < Ca < Mg
P < Cl < Ca < Mg
B.
Cl < P < Mg < Ca
With the increase in the number of electron in the same shell, the atomic radii decrease due to increase in effective nuclear charge. However, atomic radii increases, as the number of shells increases. Thus, on moving down a group atomic radii increases.
The electronic configuration of the given elements is
Mg12 = [Ne] 3s2
Ca20 = [Ar] 4s2
P15 = [Ne]3s2 3p3
Cl17 = [Ne] 3s2 3p5
In Mg, P and Cl, the number of electrons is increasing in the same shell thus, the order of their atomic radii is
Cl <P < Mg
In Ca, the electron is entering in the higher shell, thus, it has the highest atomic radii among the given. Thus, the order of radii is
Cl < P < Mg < Ca
Among the following which one has the highest cation to anion size ratio?
CsI
CsF
LiF
LiF
Which one of the element with the following outer orbital configuration may exhibit the largest number of oxidation states?
3d5,4s2
3d5,4s1
3d5,4s2
3d5,4s2
Oxidation number of P in PO43-, of S in SO42- and that of Cr in Cr2O72- are respectively,
+5,+6 and +6
+3, + 6 and +5
+5,+3 and +6
+5,+3 and +6
Amongst the elements with following electronic configuration, which one of them may have the highest ionisation energy?
[Ne] 3s2 3p3
[Ne] 3s2 3p2
[Ar] 3d10, 4s2 4p3
[Ar] 3d10, 4s2 4p3
The correct order of decreasing second ionisation enthalpy of Ti (22), V (23), Cr(24) and Mn (25) is
Cr > Mn> V > Ti
V > Mn > Cr >Ti
Mn > Cr> Ti >V
Mn > Cr> Ti >V
The sequence of ionic mobility in aqueous solution is
K+ > Na+ > Rb+ > Cs+
Cs+ > Rb+ > K+ >Na+
Rb+ > K+> Cs+ > Na+
Rb+ > K+> Cs+ > Na+
Which of the following oxidation states are the most characteristics for lead and tin respectively?
+4,+2
+2,+4
+4,+4
+4,+4
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