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Which of the following species have linear molecular geometries? Ⅰ. C2H2 Ⅱ. OF2 Ⅲ. I3- Ⅳ. NO2- Ⅰ only Ⅱ and Ⅲ Ⅰ, Ⅱ and Ⅳ Ⅰ and Ⅲ Ⅰ, Ⅱ, Ⅲ and Ⅳ