The correct statement about B₂H₆ is:

1. Terminal B–H bonds have less p-character when compared to bridging bonds.

2. The two B–H–B bonds are not of the same length.

3. All B–H–B angles are 120°.

4. Its fragment, BH_3, behaves as a Lewis base.

Among the following, the number of halide(s)  which is/are inert to hydrolysis is _______.

1. BF₃

2. SiCl₄

3. PCl₅

4. SF₆

Diborane ($B_2{H}_6$) reacts independently with $O_2$ and $H_{2}O$ to produce, respectively:

1.  $H_{3}B{O}_3<mspace\; width="1em"></mspace>and<mspace\; width="1em"></mspace>B_2{O}_3$
2. $B_2{O}_3<mspace\; width="1em"></mspace>and<mspace\; width="1em"></mspace>H_{3}B{O}_3<mspace\; width="1em"></mspace>$
3. $B_2{O}_3<mspace\; width="1em"></mspace>and<mspace\; width="1em"></mspace>{\left[B{H}_4\right]}^{-}$
4. $HB{O}_2<mspace\; width="1em"></mspace>and<mspace\; width="1em"></mspace>H_{3}B{O}_3<mspace\; width="1em"></mspace>$

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 number of pentagons in C₆₀ and trigons (triangles) in white phosphorus, respectively, are :

1. 12 and 3

2. 20 and 3

3. 20 and 4

4. 12 and 4

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

The C–C bond length is maximum in:

1. C₆₀

2. Diamond

3. Graphite

4. C₇₀

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 

In the structure of silicon dioxide: