Answer:

Step-by-step explanation:
Here, we want to select an option that represents a chemical property of carbon
Let us take a look at the options;
a) This is a physical property that talks about the color of the gas at a certain temperature
b) This is a physical property that talks about the smell of the gas at a certain temperature
c) This is a physical property that talks about the weight in comparison to the same weight of air at that particular temperature
d) This is a chemical reaction as an entirely new substance will be formed