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 given box

The total number of compounds having expanded octet around the central atom is

1.  2

2.  4

3.  2

4.  3

Which of the following atomic orbitals will show zero overlaps? (consider x-axis as the molecular axis)

1.  $P_x, P_x$

2.  $P_y, P_y$

3.  $P_y, P_z$

4.  $P_x, s$

The lattice energies of NaCl, NaF, KCl, and RbCl follow the order:

1.  KCl < RbCl < NaCl < NaF

2.  NaF < NaCl < KCl < RbCl

3.  RbCl < KCl < NaCl < NaF

4.  NaCl < RbCl < NaF < KCl

The molecule that has maximum covalent character

1.  NaH

2.  ${\mathrm{Na}}_2\mathrm{S}$

3.  ${\mathrm{CaCl}}_2$

4.  ${\mathrm{SnCl}}_4$