The correct statements among I to III regarding group 13 element oxides are:
(I) Boron trioxide or diboron trioxide is acidic.
(II) Oxides of aluminium and gallium are amphoteric.
(III) Oxides of indium and thallium are basic.
1. (I) and (II) only
2. (I) and (III) only
3. (II) and (III) only
4. (I), (II), and (III) only

C₆₀, an allotrope of carbon contains :

1. 16 hexagons and 16 pentagons.
2. 12 hexagons and 20 pentagons.
3. 18 hexagons and 14 pentagons.
4. 20 hexagons and 12 pentagons.

Which of the following explains why boron is unable to form the BF₆³⁻ ion?

1. Non-availability of s orbitals

2. Non-availability of d orbitals

3. Non-availability of f orbitals

4. None of the above

Consider the following statements

Identify the correct statement(s):

1. Only iii

2. i, ii

3. ii, iii

4. Only ii

Diamond is covalent, yet it has a high melting point, due to:

In view of the signs of ${∆}_{\mathrm{r}}\mathrm{G}°$ for the following reactions:

$\begin{array}{l}{\mathrm{PbO}}_2+\mathrm{Pb}\to 2\mathrm{PbO},{\mathrm{\Delta }}_{\mathrm{r}}{\mathrm{G}}^{\circ }<0\\ {\mathrm{SnO}}_2+\mathrm{Sn}\to 2\mathrm{SnO},{\mathrm{\Delta }}_{\mathrm{r}}{\mathrm{G}}^{\circ }>0\end{array}$

The oxidation states more characteristic for lead and tin are respectively:

1. For lead +2, for tin +2

2. For lead +4, for tin +4

3. For lead +2, for tin +4

4. For lead +4, for tin +2 

Which of the following explains why diamond is extremely hard while graphite is soft, even though both are made of carbon atoms?

In the borax bead test, the coloured bead is formed due to the formation of:

1. Orthoborate

2. Metaborate

3. Double oxide

4. Tetraborate

Match the species in Column-I with their corresponding hybridisation in Column-II:

Codes:

Me₃SiCl is used during polymerization of organ silicones because

Choose the correct option: