An excessive content of CO₂ is responsible for global warming as:

1.	Higher the level of carbon dioxide, higher is the amount of heat trapped.
2.	Higher the level of oxygen, higher is the amount of heat trapped.
3.	Higher the level of carbon dioxide, lesser is the amount of heat trapped.
4.	Higher the level of oxygen, lesser is the amount of heat trapped.

The sharp decrease in ionization enthalpy from carbon to silicon happens because of-

The correct explanation for the lower atomic radius of Ga as compared to Al is -

1. Poor shielding effect of the 2d-electrons

2. Poor shielding effect of the 3d-electrons

3. Poor shielding effect of the 3p-electrons

4. Poor shielding effect of the 2s-electrons

Amphoteric oxides are:

1. Tl₂O₃, SiO₂

2. ${\mathrm{CO}}_2$, ${\mathrm{B}}_2{\mathrm{O}}_3$

3. ${\mathrm{B}}_2{\mathrm{O}}_3$, ${\mathrm{SiO}}_2$

4. Al₂O₃ , PbO₂

An aqueous solution of Borax is-

Boric acid is polymeric due to-

1. Its acidic nature.

2. The presence of hydrogen bonds.

3. Its monobasic nature.

4. Its geometry.

The hybridization of boron in diborane is-

1. sp

2. s${\mathrm{p}}^2$

3. s${\mathrm{p}}^3$

4. ds${\mathrm{p}}^2$

Thermodynamically the most stable form of carbon is-

The incorrect statement among the given options is :

The incorrect statement regarding allotropes/allotropy is :