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.

Options

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

Answer

To solve the question, we need to evaluate each statement provided and determine which ones are correct.

### Step-by-Step Solution:

1. **Evaluate Statement a: `CO_2(g)` is used as refrigerant for ice-cream and frozen food.**
- Carbon dioxide (CO₂) is indeed used in refrigeration, but it is primarily in its solid form (dry ice) for freezing applications. The gaseous form of CO₂ is not typically used as a refrigerant for ice cream and frozen food. Therefore, this statement is **incorrect**.

2. **Evaluate Statement b: The structure of `C_(60)` contains twelve six-carbon rings and twenty five carbon rings.**
- The structure of C₆₀, also known as Buckminsterfullerene or buckyballs, consists of 12 pentagonal rings and 20 hexagonal rings. It does not contain any 25-carbon rings. Thus, this statement is **incorrect**.

3. **Evaluate Statement c: ZSM-5, a type of zeolite, is used to convert alcohols into gasoline.**
- ZSM-5 is indeed a type of zeolite catalyst used in the petrochemical industry to convert methanol and other larger alcohols into gasoline. Therefore, this statement is **correct**.

4. **Evaluate Statement d: CO is colorless and odourless gas.**
- Carbon monoxide (CO) is known to be a colorless and odorless gas, making it difficult to detect. Therefore, this statement is **correct**.

### Conclusion:
The correct statements from the options provided are:
- Statement c: ZSM-5 is used to convert alcohols into gasoline.
- Statement d: CO is colorless and odorless gas.

Thus, the final answer is that statements **c and d are correct**.