GED Science Practice

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Prepare for the GED Science Test with our comprehensive quizzes. Study with flashcards and multiple-choice questions, each providing hints and explanations. Ensure your success on the GED Science Exam!

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What is a heavy, odorless, colorless gas formed during respiration and by the decomposition of organic substances?

Carbon Dioxide
Carbon Monoxide
Carcinoma
Catalyst

The correct answer is: Carbon Monoxide

Carbon dioxide is incorrect because while it is a colorless gas formed during respiration, it is not odorless or heavy. Carbon monoxide is the correct answer because it is both odorless and heavier than air. Carcinoma is a type of cancer and has nothing to do with respiration or organic decomposition. Catalyst is a substance that speeds up a chemical reaction, but it is not a gas and is not formed during respiration or decomposition. Therefore, the only correct answer is carbon monoxide.