Out of the following lists of substances, which list contains all compounds:
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Ca, H₂ and NaCl
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H₂, He₂ and Ar₂
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H₂O, CO₂, NaCl
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Hydrogen gas, oxygen gas and carbon
📝 Detailed explanation
H₂O, CO₂ and NaCl are all compounds because they contain more than one element chemically combined.
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