Multiple Choice QuestionsWhich 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
The stability of +1 oxidation state among Al, Ga, In and TI increases in the sequence
Ga<In< Al<Tl
Al<Ga<In<Tl
Tl<In<Ga<Al
Tl<In<Ga<Al
The variation of the boiling point of the hydrogen halides in the order HF > Â HI > HBr > HCl. What explains the higher boiling point of hydrogen fluoride?
The electronegativity of fluorine is much higher than for other elements in the group
There is strong hydrogen bonding between HF molecules
The bond energy of HF molecules is greater than in other hydrogens halides
The bond energy of HF molecules is greater than in other hydrogens halides
Strong reducing behaviour of H3PO4 is due to
the presence of one -OH group and two P-H bonds
high electron gain enthalpy of phosphorousÂ
the high oxidation state of phosphorus
the high oxidation state of phosphorus
Oxidation states of P in H4P2O5, H4P2O6, H4P2O7, are respectively
+3, +5, +4
+5, +3, +4
+5, +4,+3
+5, +4,+3
Switch
