Question

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

• A. (a), (b) and (c) only
• B. (a) and (c) only
• C. (b) and (c) only
• D. (c) and (d) only

Answer 1

The Correct Option is D

Let's analyze each statement to determine its correctness:

1. Statement (a): \(CO_2(g)\) is used as a refrigerant for ice-cream and frozen food.
   This statement is incorrect. While \(CO_2(g)\), in the form of dry ice, is used for freezing, it is not typically used as a refrigerant in systems for ice cream or frozen foods. Common refrigerants used are ammonia, chlorofluorocarbons (CFCs), etc.
2. Statement (b): The structure of \(C_{60}\) contains twelve six-carbon rings and twenty-five carbon rings.
   This statement is incorrect. The structure of \(C_{60}\) (fullerene or buckyball) consists of 12 pentagonal rings and 20 hexagonal rings, not five-carbon rings.
3. Statement (c): \(ZSM-5\), a type of zeolite, is used to convert alcohols into gasoline.
   This statement is correct. \(ZSM-5\) is a type of zeolite catalyst used in the petrochemical industry for the conversion of alcohols and other compounds to hydrocarbons, including gasoline.
4. Statement (d): \(CO\) is a colorless and odorless gas.
   This statement is correct. Carbon monoxide (\(CO\)) is indeed a colorless and odorless gas, which makes it particularly dangerous as it cannot be detected by human senses.

Based on the analysis above, the correct statements are (c) and (d). Therefore, the correct answer is: (c) and (d) only.