Identify the correct statements from the following:
(a) $CO_2(g)$ is used as a refrigerant for ice cream and f

Question

Identify the correct statements from the following:
(a) $CO_2(g)$ is used as a refrigerant for ice cream and frozen food.
(b) The structure of $C_{60}$ contains twelve six-carbon rings and twenty-five five-carbon rings.
(c) ZSM-5, a type of zeolite, is used to convert alcohols into gasoline.
(d) CO is a colorless and odorless gas.

Accepted Answer

1.  **Statement (a) is Incorrect:** Solid $CO_2$ (known as Dry Ice), not gaseous $CO_2$, is used as a refrigerant for ice cream and frozen food because it sublimes directly to gas at –78°C, providing cooling without leaving liquid residue [Source 105 mentions sublimation of dry ice].
2.  **Statement (b) is Incorrect:** Buckminsterfullerene ($C_{60}$) has a shape like a soccer ball. It contains **20 six-membered rings** (hexagons) and **12 five-membered rings** (pentagons), not the numbers stated in the option.
3.  **Statement (c) is Correct:** ZSM-5 is a shape-selective zeolite catalyst with a pore structure that allows it to convert alcohols (like methanol) directly into gasoline (a mixture of hydrocarbons) by dehydration.
4.  **Statement (d) is Correct:** Carbon monoxide (CO) is a colorless, odorless, and almost water-insoluble gas. Its odorless nature makes it particularly dangerous as a pollutant [Source 123 discusses CO toxicity].

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