Which of the following is a sulfur form that exists as a gas?

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Multiple Choice

Which of the following is a sulfur form that exists as a gas?

Explanation:
Gas-form sulfur compounds are those that exist as a gas at room temperature. Sulfur dioxide is a simple sulfur oxide that is a gas under ambient conditions, so it directly fits the criterion. The other options are not gases containing sulfur: potassium metabisulfite and potassium bisulfite are solid sulfite salts (they can release SO2 when dissolved or heated, but as solids they are not gases). Water contains no sulfur at all. Therefore, the sulfur form that exists as a gas is sulfur dioxide.

Gas-form sulfur compounds are those that exist as a gas at room temperature. Sulfur dioxide is a simple sulfur oxide that is a gas under ambient conditions, so it directly fits the criterion. The other options are not gases containing sulfur: potassium metabisulfite and potassium bisulfite are solid sulfite salts (they can release SO2 when dissolved or heated, but as solids they are not gases). Water contains no sulfur at all. Therefore, the sulfur form that exists as a gas is sulfur dioxide.

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