Which substance has the strongest London dispersion forces?

1. $Si{H}_4$

2. $C{H}_4$

3. $Sn{H}_4$

4. $Ge{H}_4$

The compound that has the lowest boiling point is:

Which of the following is the correct order for increasing bond angle?

$\left(a\right)<mspace\; width="1em"></mspace>N{H}_3<P{H}_3<As{H}_3<Sb{H}_3<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>\left(b\right)H_{2}O<O{F}_2<C{l}_{2}O$
$\left(c\right)<mspace\; width="1em"></mspace>H_{3}T{e}^{+}<H_{3}S{e}^{+}<H_3{S}^{+}<H_3{O}^{+<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>}<mspace\; width="1em"></mspace>\left(d\right)<mspace\; width="1em"></mspace>B{F}_3<BC{I}_3<BB{r}_3<B{I}_3$

Which of the following statements correctly describes the hydrolysis of BCl₃ and NCl₃?

The correct sequence of the polarity of the following molecules is: 
a. Benzene                         

b .Inorganic Benzene

c. ${\mathrm{PCl}}_3{\mathrm{F}}_{2<mspace\; width="1em"></mspace>}$                           

d. ${\mathrm{PCl}}_2{\mathrm{F}}_3$

(Where P=polar, NP=non-polar)

The incorrect order of boiling point is-

1. ${\mathrm{H}}_2\mathrm{O}<mspace\; width="1em"></mspace>><mspace\; width="1em"></mspace>{\mathrm{CH}}_3\mathrm{OH}$             

2. $\mathrm{N}{\left({\mathrm{CH}}_3\right)}_3<<mspace\; width="1em"></mspace>\mathrm{NH}{\left({\mathrm{CH}}_3\right)}_2$

3. ${\mathrm{H}}_3{\mathrm{PO}}_4><mspace\; width="1em"></mspace>{\mathrm{Me}}_3{\mathrm{PO}}_4$         

4. ${\mathrm{CH}}_3{\mathrm{N}}_3><mspace\; width="1em"></mspace>{\mathrm{HN}}_3$

When the substances Si, KCl, $C{H}_3$OH and $C_2{H}_6$ are arranged in order of increasing melting point , what is the correct order?

(1) Si, KCl ,$C{H}_3$OH ,$C_2{H}_6$

(2) $C{H}_{3}OH$, $C_2{H}_6$, Si ,KCl 

(3) KCl, Si, $C_2{H}_6$, $C{H}_{3}OH$

(4) $C_2{H}_6,<mspace\; width="1em"></mspace>C{H}_{3}OH<mspace\; width="1em"></mspace>,<mspace\; width="1em"></mspace>KCl<mspace\; width="1em"></mspace>,<mspace\; width="1em"></mspace>Si$

Iodine molecules are held in the solid lattice by:

1.  London forces                 2.  dipole-dipole interactions

3.  Covalent bonds               4.  coulombic force

Which substance has the highest melting point ? 

1.  CO

2.  $C{O}_2$

3.  $Si{O}_2$

4.  $P_2{O}_5$

Nodal planes of $\mathrm{\pi }-\mathrm{bond}\left(\mathrm{s}\right)<mspace\; width="1em"></mspace>\mathrm{in}<mspace\; width="1em"></mspace>{\mathrm{CH}}_2=\mathrm{C}=\mathrm{C}={\mathrm{CH}}_2<mspace\; width="1em"></mspace>\mathrm{are}<mspace\; width="1em"></mspace>\mathrm{located}<mspace\; width="1em"></mspace>\mathrm{in}:$

(1) all are in molecular plane

(2) two in a molecular plane and in a plane peerpendicular to moleclar plane which contains $\mathrm{C}-\mathrm{C}<mspace\; width="1em"></mspace>\mathrm{\sigma }-\mathrm{bond}$

(3) one in molecular plane and two in plane perpendicular to molecular plane which bisects $\mathrm{C}-\mathrm{C}<mspace\; width="1em"></mspace>\mathrm{\sigma }-\mathrm{bonds}$

(4) two in a molecular plane and one in a plane perpendicular to molecular plane which bisects $\mathrm{C}-\mathrm{C}<mspace\; width="1em"></mspace>\mathrm{\sigma }-\mathrm{bonds}$ at right angle.