CHEMICAL BONDING QUIZ XI Part II

11.The following substances which has the lowest melting point is ….
a.gold, Au
b.sand, SiO2
c.water, H2O
d.butane, C4H10
e.salt, NaCl
12.Which of the following is arranged in order of increasing boiling points?
a.CH4, HF, O2
b.HF, HCl, HBr
c.H2S, H2Se, H2O
d.H2O, He, N2
e.HF, H2O, NH3
13.How can the physical properties of substances be explained?
a.In terms of chemical bonds only
b.In terms of intermolecular forces only
c.In terms of chemical bonds and intermolecular forces
14.In terms of ionic bonding only
In general, what do the physical properties of substances include?
a.conductivity, malleability, solubility and hardness only
b.conductivity, malleability, solubility, hardness, melting and boiling point only
c.conductivity, solubility, hardness, melting and boiling point only
d.solubility, hardness, melting and boiling point only
15.The boiling point of water is about 200°C higher than one would predict from the boiling points of hydrogen sulfide and hydrogen selenide. One may explain this apparent anomaly by which of the following?
a.the H-O covalent bond is much stronger than the H-S and H-Se bonds.
b.the intermolecular attractive forces are much greater in water than in hydrogen sulfide and hydrogen selenide.
c.the water molecule is lighter than the other two molecules.
d.water has the lowest molecular weight.
e.water is less polar than hydrogen sulfide and hydrogen selenide.
16.The boiling point of CH4 is much lower than that of HF. This is because ….
a.CH4 is polar
b.HF is more polarizable.
c.of hydrogen bonding in HF
d.of dipole-dipole interactions in CH4
e.the molecule of HF linier
17.Based on the following information:
CF4, Molecular Weight 87.99, Normal Boiling Point -182°C
CCl4, Molecular Weight 153.8, Normal Boiling Point -123°C
The reason that CCl4 has a higher boiling point than CF4 is that ....
a.CCl4 molecules are more polar
b.CF4 molecules are more polar
c.CF4 molecule have a greater polarizability
d.CCl4 molecules have a greater polarizability
e.electronegativity of F atom is greater than Cl atom
18.The wrong statement about methane, ammonia, and water is ….
a.each molecule has certain shape
b.the geometry of methane is tetrahedral
c.the hybridization state of H2O is sp3
d.all molecules have the same geometry
e.the molecule shape of ammonia is pyramid
19.If the molecules of BF3 and NH3 are compared one of another, the correct answer is ....
a.BF3 is polar
b.BF3 doesn’t have lone pair electron
c.NH3 is non polar
d.NH3 has lone pair electron
e.The hybridization state of NH3 is sp2
20.The hybridization state of PCl5 is ….
a.sp
b.sp3
c.sp3d
d.sp2
e.sp3d2