Boric acid is an acid because its molecule

1. Contains replaceable H⁺ ion

2. Gives up a proton

3. Accepts OH^- from water releasing proton

4. Combines with proton from water molecule

Catenation i.e., linking of similar atoms depends on the size and electronic configuration of atoms. The

the tendency of catenation in group 14 elements follows the order-

1.  $\mathrm{C}>\mathrm{Si}>\mathrm{Ge}>\mathrm{Sn}$

2.  $\mathrm{C}>>\mathrm{Si}>\mathrm{Ge}\approx \mathrm{Sn}$

3.  $\mathrm{Si}>\mathrm{C}>\mathrm{Sn}>\mathrm{Ge}$

4.  $\mathrm{Ge}>\mathrm{Sn}>\mathrm{Si}>\mathrm{C}$

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

In the structure of diborane,

Identify the correct resonance structures of carbon dioxide from one 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:

1. (a, b)

2. (b, c)

3. (c, d)

4. (b, d)

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-

1.  Pb

2.  Si

3.  Ti

4.  Sn

The most commonly used reducing agent among the following is :

1. AlCl₃ 

2. PbCl₂

3. SnCl₄

4. SnCl₂

Dry ice is-

1. Solid NH₃

2. Solid SO₂

3. Solid CO₂

4. Solid N₂