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hydrogen
If the person posting the question is looking for a gas that is an element perhaps the answer they are looking for is Chlorine [Not that Hydrogen is not an element but I do not recall it having colour]
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∙ 12y agoThis answer is:
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Wiki User
∙ 11y agomustard gas
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Chlorine
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Earn +20 ptsQ: What gas smells and is green yellow?
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What element is yellow solid and has a gas form that smells like a rotten egg?
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