Silicon has a strong tendency to form polymers like silicones. The chain length of silicone polymer can be controlled by adding

1.	${\mathrm{MeSiCl}}_3$	2.	${\mathrm{Me}}_2{\mathrm{SiCl}}_2$
3.	${\mathrm{Me}}_3\mathrm{SiCl}$	4.	${\mathrm{Me}}_4\mathrm{Si}$

The correct order of Ionization enthalpy (∆_iH kJ mol^–1)  for the elements of group 13 among the following is:

1. B > Al > Ga > In > Tl

2. B < Al < Ga < In < Tl

3. B < Al > Ga < In < Tl

4. B > Al < Ga > In < Tl

Which of the following is true regarding the structure of diborane?

Identify more than one correct resonance structure of carbon dioxide from the ones given below:

a.  ${}^{-}\mathrm{O}-\mathrm{C}={\mathrm{O}}^{+}$

b.  $\mathrm{O}=\mathrm{C}=\mathrm{O}$

c.  ${}^{-}\mathrm{O}\equiv \mathrm{C}-{\mathrm{O}}^{+}$

d.  ${}^{-}\mathrm{O}-\mathrm{C}\equiv {\mathrm{O}}^{+}$

Choose the correct option:

A compound X, of boron, reacts with NH₃ on heating to give another compound Y which is called inorganic benzene. The compound X can be prepared by treating BF₃ with lithium aluminum hydride. The compounds X and Y are represented by the formulas.

1.  B₂H₆, B₃N₃H₆

2.  B₂O₃, B₃N₃H₆

3.  BF₃, B₃N₃H₆

4.  B₃N₃H₆, B₂H₆

Quartz is extensively used as a piezoelectric material, it contains-

The most commonly used reducing agent among the following is :

1. AlCl₃ 

2. PbCl₂

3. SnCl₄

4. SnCl₂

What is dry ice?

Which of the following reasons explain why gallium has a smaller atomic radius than aluminium?

a. Poor screening effect of d and f orbitals

b. Increase in nuclear charge

c. Presence of higher orbitals

d. Higher atomic number

Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

The linear shape of CO₂ is due to:

a.  sp³ hybridisation of carbon

b.  sp hybridisation of carbon

c.  $\mathrm{p\pi }-\mathrm{p\pi }$ bonding between carbon and oxygen

d.  sp² hybridisation of carbon

Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)