Multiple Choice QuestionsName the type of the structure of silicates in which one oxygen atom of [SiO4]4- is shared?
Sheet silicate
Pyrosilicate
Three-dimensional silicate
Three-dimensional silicate
The tendency of BF3, BCl3 and BBr3 to behave as Lewis acid decreases in the sequence
BCl3 > BF3 > BBr3
BBr3 > BCl2 > BF3
BBr3 > BF3 > BCl3
BBr3 > BF3 > BCl3
The correct regarding the electronegativity of hybrid orbitals of carbon is:
sp> sp2<sp3
sp> sp2 > sp3
sp< sp2 > sp3
sp< sp2 > sp3
The correct order of atomic radii in group 13 elements is
B < Al < In < Ga < Tl
B < Al < Ga < In < Tl
B < Ga < Al < In < Tl
B < Ga < Al < Tl < In
In which of the following, the oxidation number of oxygen has been arranged in increasing order?
BaO2 < KO2 < O3 < OF2
OF2 < KO2 < BaO2 <O3
BaO2 < O3 < OF2 < KO2
KO2 < OF2 < O3 < BaO2
The magnitude of screening effect depends upon the number of
inner electrons
outer electrons
bond order
Both (a) and (b)
A.
inner electrons
Electrons in an atom can shield each other from the pull of the nucleus. This effect, called the shielding effect, describes the decrease in attraction between an electron and the nucleus in any atom with more than one electron shell. The more electron shells there are, greater is the shielding effect experienced by the outermost electrons. The magnitude of screening effect depends on the number of electrons in the inner shell.
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