Multiple Choice QuestionsThe Correct order of increasing bond length of C - H, C-O, C - C and C = C is
C - C < C=C < C - O < C - H
C - O < C - H < C - C < C = C
C - H < C - O < C - C < C= C
C - H < C = C < C - O < C - C
Which of the following structures is the most preferred and hence of lowest energy of SO3 ?
D.
Formal charges help in the selection of the lowest energy structure from a number of possible energy structure from a number of possible Lewis structures for a given species. Generally, the lowest energy structure is the one with the smallest formal charges on the atoms.
Formal charge on an atom: = total number of valence electrons- non - bonding electrons - 1/2 x bonding electrons.
For lewis structure of SO3
Formal charge on three O atoms
In which of the following pairs, both the species are not isostructural?
SiCl4.PCl4+
Diamond, carbide
NH3, PH3
NH3, PH3
In which of the following pairs of molecules/ions, the central atoms have sp2 hybridization?
NO2- and NH3
BF3 and NO2-
NH2- and H2O
NH2- and H2O
Which one of the following species does not exist under normal conditions?
Be2+
Be2
B2
B2
In which one of the following species the central atom has the type of hybridisation which si not the same as that present in the other three?
SF4
I3-
SbCl52-
SbCl52-
The correct order of the decreasing ionic radii among the following isoelectronic species is
Ca2+ > K+ >S2- > Cl-
Cl- > S2- > Ca2+ > K+
S2- > Cl- > K+ > Ca2+
S2- > Cl- > K+ > Ca2+
is
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