Colorless, odorless gas, suffocating, and flammable.

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Multiple Choice

Colorless, odorless gas, suffocating, and flammable.

Explanation:
A gas that is colorless and odorless, can suffocate you at high concentrations, and is flammable points to methane. Methane is a simple hydrocarbon (CH4) that's normally odorless, and when it leaks it can accumulate and displace oxygen, leading to asphyxiation. It is also highly flammable and forms explosive mixtures with air. Carbon dioxide, while also colorless and odorless and capable of suffocating at high levels, is not flammable, so it doesn’t fit the flammable part. Hydrogen sulfide is toxic and has a strong odor at detectable concentrations, so it’s not odorless. The description best matches methane.

A gas that is colorless and odorless, can suffocate you at high concentrations, and is flammable points to methane. Methane is a simple hydrocarbon (CH4) that's normally odorless, and when it leaks it can accumulate and displace oxygen, leading to asphyxiation. It is also highly flammable and forms explosive mixtures with air. Carbon dioxide, while also colorless and odorless and capable of suffocating at high levels, is not flammable, so it doesn’t fit the flammable part. Hydrogen sulfide is toxic and has a strong odor at detectable concentrations, so it’s not odorless. The description best matches methane.

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