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

Boric acid is polymeric due to-

1. Its acidic nature.

2. The presence of hydrogen bonds.

3. Its monobasic nature.

4. Its geometry.

The incorrect statement among the given options is :

The correct reaction(s) among the following options is/are -

1. ${\mathrm{SiO}}_2$ $+\hspace{0.17em}4\mathrm{HF}$ $\to$ ${\mathrm{SiF}}_4$ $+$ $2{\mathrm{H}}_2\mathrm{O}$

2. $\mathrm{ZnO}$ $+$ $\mathrm{CO}$ $\to$ $\mathrm{Zn}$ $+\hspace{0.17em}{\mathrm{CO}}_2$

3. ${\mathrm{SiF}}_4$ $\hspace{0.17em}+$ $2\mathrm{HF}$ $\to$ ${\mathrm{H}}_2{\mathrm{SiF}}_6$

4. All of the above

Which statement among the following is incorrect?

The correct statement(s) regarding diborane and boric acid is/are-

1. Diborane has two 3c-2e^- bonds.

2. Boric acid has a layered structure.

3. Four 2c-2e^- bonds are present in diborane.

4. All of the above

The incorrect statement among the following options is-

The correct statement(s) among the following options is/are:

The incorrect statement regarding diamond and graphite is-

Consider the following reaction,

$\mathrm{Al}+\mathrm{NaOH}\to \mathrm{X}+{\mathrm{H}}_2$
${\mathrm{B}}_2{\mathrm{H}}_6<mspace\; width="1em"></mspace>+<mspace\; width="1em"></mspace>{\mathrm{NH}}_3\to \mathrm{Y}$

X and Y in the above reaction are:

$1.<mspace\; width="1em"></mspace>\mathrm{X}=<mspace\; width="1em"></mspace>\mathrm{Al}{\left(\mathrm{OH}\right)}_2<mspace\; width="1em"></mspace>;<mspace\; width="1em"></mspace>\mathrm{Y}<mspace\; width="1em"></mspace>=<mspace\; width="1em"></mspace>{\mathrm{N}}_2\left[{\mathrm{BH}}_4\right]$
$2.<mspace\; width="1em"></mspace>\mathrm{X}<mspace\; width="1em"></mspace>=\mathrm{Na}\left[\mathrm{Al}{\left(\mathrm{OH}\right)}_4\right]<mspace\; width="1em"></mspace>;<mspace\; width="1em"></mspace>\mathrm{Y}<mspace\; width="1em"></mspace>={\mathrm{N}}_3{\mathrm{B}}_3{\mathrm{H}}_6$
$3.<mspace\; width="1em"></mspace>\mathrm{X}=<mspace\; width="1em"></mspace>\mathrm{Na}\left[\mathrm{Al}{\left(\mathrm{OH}\right)}_4\right]<mspace\; width="1em"></mspace>;<mspace\; width="1em"></mspace>\mathrm{Y}<mspace\; width="1em"></mspace>=<mspace\; width="1em"></mspace>{\mathrm{B}}_3{\mathrm{N}}_2$
$4.<mspace\; width="1em"></mspace>\mathrm{None}<mspace\; width="1em"></mspace>\mathrm{of}<mspace\; width="1em"></mspace>\mathrm{the}<mspace\; width="1em"></mspace>\mathrm{above}$