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    Question

    Which of the following gases, when cooled and

    compressed, can change from a gas to a supercritical fluid state? 
    A Oxygen (O₂) Correct Answer Incorrect Answer
    B Hydrogen (H₂) Correct Answer Incorrect Answer
    C Carbon dioxide (CO₂) Correct Answer Incorrect Answer
    D Steam Correct Answer Incorrect Answer

    Solution

    The correct answer is C

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