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17 December, 15:09

Select the correct answer. A sample of physical evidence was heated with dry cupric oxide. The issuing gas turned lime water milky. Which element does the physical evidence contain? A. oxygen B. hydrogen C. carbon D. bromine E. chlorine

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  1. 17 December, 15:45
    Answer: C - carbon


    Carbon dioxide (CO2) turns lime water milky due to the formation of insoluble calcium carbonate, CaCO3. Sulphur dioxide (SO2) also does the same, but slowly, as it reacts with calcium hydroxide to form insoluble calcium sulphite.

    The physical evidence contain carbon elements
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