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A student takes about 2 ml ethanoic acid in a dry test tube and adds a pinch of sodium hydrogen carbonate to it. He reports the following observations : I. Immediately a colourless and odorless gas evolves with a brisk effervescence. II. The gas turns lime water milky when passed through it. III. The gas burns with an explosion when a burning splinter is brought near it‘ IV. The gas extinguishes the burning splinter that is brought near it. The correct observations are : (A) 1, II and III (B) It, 111 and IV (C) III, IV and I (D) I, II and IV

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