In the structure of silicon dioxide:

1.	There are double bonds between silicon and oxygen atoms.
2.	Silicon atom is bonded to two oxygen atoms.
3.	Each silicon atom is surrounded by two oxygen atoms and each oxygen atom is bonded to two silicon atoms.
4.	Each silicon atom is surrounded by four oxygen atoms and each oxygen atom is bonded to two silicon atoms.

The structure of diborane (B₂H₆) contains:

Aluminium chloride exists as dinner, Al₂Cl₆ in the solid state as well as in the solution of non-polar solvents such as benzene. When dissolved in acidified aqueous solution, it gives:

1. \(\mathrm{Al}^{3+}+3 \mathrm{Cl}^{-}\)

2. \(\left[\mathrm{Al}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}+3 \mathrm{Cl}^{-} \)

3. \(\left[\mathrm{Al}(\mathrm{OH})_{6}\right]^{3-}+3 \mathrm{HCl}\)

4. \(\mathrm{Al}_{2} \mathrm{O}_{3}+6 \mathrm{HCl}\)

Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behavior is that graphite : 

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 among the following halides is inert towards hydrolysis?

1. BF₃

2. SiCl₄

3. PCl₅

4. SF₆

The correct statement about B₂H₆ is:

The C–C bond length is maximum in:

1. C₆₀

2. Diamond

3. Graphite

4. C₇₀

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

The correct order of catenation is :

1. C > > Sn > Si $\approx$ Ge

2. Si > Sn > C > Ge

3. C > > Si > Ge $\approx$ Sn

4. Ge > Sn > Si > C