Multiple Choice QuestionsSolubility of the alkaline earth's metal sulphates in water decreases in the sequence
Mg>Ca>Sr>Ba
Ca>Sr>Ba>Mg>
Sr>Ca>Mg>Ba
Sr>Ca>Mg>Ba
The number of d- electrons in Fe2+ (Z = 26) is not equal to the number of electrons in which one of the following?
S- electronic in Mg (Z=12)
p-electrons in Cl( Z=17)
d- electrons in Fe (Z=26)
d- electrons in Fe (Z=26)
which of the following orders of ionic radii is correctly represented?
H- > H >H+
Na+ >F- >O2-
F- > O2->Na+
F- > O2->Na+
Identify the wrong statement in the following.
Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius
Amongst isoelectronic species, greater the negative charge on the anion, larger is the ionic radius
Atomic radius of the elements increases as one moves down the first group of the periodic table
Atomic radius of the elements increases as one moves down the first group of the periodic table
Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements O, S, F and Cl?
Cl < F < O < S
O < S < F< Cl
F < S < O < Cl
F < S < O < Cl
Which of the following pairs has the same size?
Fe2+ , Ni2+
Zr4+, Ti4+
Zr4+, Hf4+
Zr4+, Hf4+
C.
Zr4+, Hf4+
In general, the atomic and ionic radii increases on moving down a group. But the elements of second transition series (eg, Zr, Nb, Mo etc) have the almost same radii as the elements of third transition series (eg Hf, Ta, W etc.) This is because of lanthanide contraction i.e imperfect shielding of one 4f- electron by another.
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
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