Which of the following oxide is amphoteric in nature?

1. SnO₂

2. SiO₂

3. GeO₂

4. CO₂

Which of the following statements is incorrect?

Incorrect statement among the following about zeolites is:

In a Borax bead test, which compound is formed: 

1. Orthoborate

2. Metaborate

3. Double oxide

4. Tetraborate

$Pb{O}_2$ $\to$ $PbO$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $∆G_{298}$ $<0$
$Sn{O}_2\to SnO$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $$ $∆G_{298}$ $>$ $0$

The most probable oxidation state of Pb & Sn will be:

1. ${\mathrm{Pb}}^{+4},$ ${\mathrm{Sn}}^{+4}$

2. ${\mathrm{Pb}}^{+4}$ $,$ ${\mathrm{Sn}}^{+2}$

3. ${\mathrm{Pb}}^{+2}$ $,$ ${\mathrm{Sn}}^{+2}$

4. ${\mathrm{Pb}}^{+2}$ $,$ ${\mathrm{Sn}}^{+4}$

BCl₃  has higher stability than ${\mathrm{TlCl}}_3$, because -

Boron trifluoride behaves as a Lewis acid because -

1. Boron trifluoride is electron-rich.

2. Boron trifluoride is electron-deficient.

3. Boron trifluoride is highly stable.

4. None of these.

The correct statement among the following regarding behavior of ${\mathrm{BCI}}_3$ $\mathrm{and}$ ${\mathrm{CCI}}_4$ in water is -

Boric acid is a-

1. Protic acid.

2. Weak monobasic acid.

3. Lewis acid.

4. Both '2' and '3'

The effect of heating Boric acid at 370 K or above is -

1. Orthoboric acid changes to metaboric acid.

2. Metaboric acid changes to boric oxide.

3. Both '1' and '2'

4. Neither '1' nor '2'