It feels like a rock. It smells like a lemon. It is colorless. It is hard.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which of the following is a property of CO2 gas?
Possibilities:
- It feels like a rock.
- It smells like a lemon.
- It is colorless.
- It is hard.

It is colorless.