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 

The bond dissociation energy of B – F in BF₃ is 646 kJ mol^–1 , whereas that of C – F in CF₄ is 515 kJ mol^–1. The correct reason for the higher B-F bond dissociation energy as compared to that of C-F is :

1. Smaller size of B-atom as compared to that of C-atom

2. Stronger σ bond between B and F in BF₃ as compared to that between C and F in CF₄

3. Significant pπ − pπ interaction between B and F in BF₃ whereas there is no possibility of such interaction between C and F in CF₄

4. Lower degree of pπ − pπ interaction between B and F in BF₃ than that between C and F in CF₄

Which one of the following boron anions cannot be formed?

1. BF₆³⁻

2. BH₄⁻

3. B(OH)₄⁻

4. BO₃^3-

Which among the following halides is inert towards hydrolysis?

1. BF₃

2. SiCl₄

3. PCl₅

4. SF₆

The correct statement about B₂H₆ is:

Given below are two statements:

In the light of the above statements, choose the most appropriate answer from the options given
below.

1. Statement I is true but Statement II is false

2. Both Statement I and Statement II are false

3. Statement I is false but Statement II is true

4. Both Statement I and Statement II are true

The C–C bond length is maximum in:

1. C₆₀

2. Diamond

3. Graphite

4. C₇₀

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.

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