The gas carbon dioxide is a pure substance. Which of the following is true about carbon dioxide? (5 points) Oa Carbon and oxygen are chemically bonded in it. Oь Carbon and oxygen retain their original

The gas carbon dioxide is a pure substance. Which of the following is true about carbon dioxide? (5 points)

Oa
Carbon and oxygen are chemically bonded in it.
Oь
Carbon and oxygen retain their original identity in it.
It can be separated into carbon and oxygen using physical methods.
Od
The proportion of carbon and oxygen is different in different samples of the gas.

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