(Answered) A student investigated the physical and chemical properties

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A student investigated the physical and chemical properties of a sample of unknown gas and then investigated the gas. Which statement represents a conclusion rather than an experimental observation?

a) The gas is colorless.

b) The gas is carbon dioxide.

c) When the gas is bubbled in limewater, the liquid becomes cloudy.

d) When placed in the gas, a flaming splint stops burning.

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