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Line 1: − It is a [[molecular]] substance with a formula CO<sub>2</sub>.+ +
one carbon atom and two oxygen atoms
'''Carbon dioxide''' is exhaled when you breathe out.
'''Carbon dioxide''' is exhaled when you breathe out.
It is used by plants in the process of [[photosynthesis]] to generate [[oxygen]].
It is used by plants in the process of [[photosynthesis]] to generate [[oxygen]].
At room temperature, it is a gas. Each molecule of carbon dioxide has one carbon atom and two oxygen atoms, so its chemical formula is CO<sub>2</sub>.