Which ionic compound has the largest lattice energy?

1.  LiF

2.  BeO

3.  KBr

4.  CaS

The boiling points of ${\mathrm{CH}}_3{\mathrm{COCH}}_3, {\mathrm{CH}}_3{\mathrm{COC}}_2{\mathrm{H}}_5 \mathrm{and} {\mathrm{CH}}_3{\mathrm{COC}}_3{\mathrm{H}}_7$ are $56°\mathrm{C}, 80°\mathrm{C}, \mathrm{and} 102°\mathrm{C}$, respectively. This increase is best attributed to an increase in which of the following?

l.  Dipole-dipole interactions.

ll.  Dispersion forces.

lll.  Hydrogen bonding.

1.  l only

2.  l  and ll.

3.  lll only

4.  ll and lll only

The lattice energy (energy required to separate the ions in an ionic solid) of MgO is much larger than that of LiF.

What contributes the most to this difference?

1.  $M{g}^{2+}$is a smaller ion than $L{i}^{+}$and $O^{2-}$ is a smaller ion than $F^{-}$

2.  F is more electronegative than O, and Li is more electropositive than Mg

3.  MgO contains doubly charged ions, while LiF contains singly charged ions

4.  MgO contains more electrons than LiF

Allene has the structure ${\mathrm{H}}_2\mathrm{C} =\mathrm{C}={\mathrm{CH}}_2$. What is the best description of the geometry of allene?

  Geometry at central carbon                    Position of hydrogen atoms

1.  Linear                                                  All in the same plane

2.  Linear                                                  In two perpendicular planes

3.  Bent                                                    All in the same plane

4.  Bent                                                    In two perpendicular planes

Which property or properties of metals can be accounted for by the electron sea model?

l.  Electrical conductivity

ll. Malleability

1.  l only

2.  ll only

3.  Both l and ll

4.  Neither l nor ll

What is the principal energetic factor in the lack of miscibility between $C_6{H}_{14}\left(l\right)$ and $H_{2}O\left(l\right)$?

1.  The strength of intermolecular forces of attraction between $C_6{H}_{14}\left(l\right)$ molecules

2.  The strength of intermolecular forces of attraction between $H_{2}O\left(l\right)$ molecules

3.  The differences between the molecular weights of the molecules

4.  The difference in electronegativity between carbon and hydrogen

The value of 'x' in ${\left({\mathrm{NH}}_4\right)}_2 \mathrm{Fe}{\left({\mathrm{SO}}_4\right)}_{\mathrm{x}}.6{\mathrm{H}}_2\mathrm{O}$ is

1.  1

2.  2

3. 3

4.  4

The correct structure of $Cl{F}_3$ is:

1.		2.
3.		4.

Select the correct statement regarding $Xe{O}_2{F}_2$ among the folowing.

a.  Xe is $s{p}^{3}d$ hybridised.

b.  4 bond pairs and 1 lone pair are present around Xe.

c.  Shape of $Xe{O}_2{F}_2$ is square pyramidal.

d.  Contains $\mathrm{d\pi }-p\pi$ bonds.

1.  a and b

2.  a,  and d

3.  a, b and d

4.  b, c and d

Consider the following compounds:
\(LiCl, BeF_2, BCl_3, IF_7, CH_4, SF_6, PCl_5\)
How many of these compounds have an expanded octet around the central atom?

1.  2

2.  4

3.  2

4.  3