Multiple Choice QuestionsThe correct bond order in the following species is
O22+ > O+2> O2-
O22+ < O+2< O2-
O22+ > O+2< O2-
O22+ > O+2< O2-
Acidity of diprotic acids in aqueous solutions increases in the order
H2S < H2Se< H2Te
H2Se <H2S <H2Te
H2Te <H2S < H2Se
H2Te <H2S < H2Se
Identify the correct order of solubility in aqueous medium
CuS> ZnS> Na2S
ZnS > Na2S> CuS
Na2S> CuS> ZnS
Na2S> CuS> ZnS
Which of the following is a polar molecule?
BF3
SF4
SiF4
SiF4
B.
SF4
Symmetrical molecules are generally non-polar although they have polar bonds. This is because bond dipole on one bond is cancelled by that of the other. BF3, Â SiF4 and XeF4 being symmetrical as non-polar. SF4 is unsymmetrical because of the presence of a lone pair of electrons. Due to which it is a polar molecule.Â
Which of the following statements is not valid for oxoacids of phosphorus?Â
Orthophosphoric acid is used in the manufacture of triple superphosphate
All oxoacids contain tetrahedral four coordinated phosphorus
All oxoacids contain tetrahedral four coordinated phosphorus
In Which of the following arrangement, the given sequence is not strictly according to the property indicated against it ?Â
HF < HCl< HBr < HI : increasing acidic strength
H2O < H2S < H2Se < H2Te : increasing pKa values.
NH3 < PH3 < AsH3 < SbH3Â : increasing acidic character
NH3 < PH3 < AsH3 < SbH3Â : increasing acidic character
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