Identify the correct statements from the following:

(a)	\(\mathrm{CO}_2(\mathrm{~g})\) is used as a refrigerant ice cream and frozen food.
(b)	The structure of \(\mathrm{C}_{60} \)  customs12 six carbon rings and 25 five carbon rings
(c)	ZSM-5, a type of zeolite, is used to convert alcohol into gasoline.
(d)	CO is a colorless and odorless gas.

 

1.	(a) and (c) only	2.	(b) and (c) only
3.	(c) and (d) only	4.	(a), (c) and (d) only

The compound among the following that used in cosmetic surgery is:

1. Silica

2. Silicates

3. Silicones

4. Zeolites

Aluminium chloride in acidified aqueous solution forms a complex 'A'.
The formula of A and hybridisation state of Al in 'A' is respectively:

1. [Al(H₂O)₆]³⁺, sp³d²

2. [Al(H₂O)₄]³⁺, sp³

3. [Al(H2O)4]3+, dsp2

4. [Al(H₂O)]³⁺, d²sp³

Which of the following oxide is amphoteric?

1. CO₂ 

2. SnO₂

3. CaO 

4. SiO₂

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

Which of the following species is not stable?