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    Question

    Which of the following oxides is soluble in water?

    A CaO Correct Answer Incorrect Answer
    B FeO Correct Answer Incorrect Answer
    C ZnO Correct Answer Incorrect Answer
    D More than one of the above Correct Answer Incorrect Answer
    E None of the above Correct Answer Incorrect Answer

    Solution

    Explanation: Calcium oxide (CaO), also known as quicklime, readily reacts with water to form calcium hydroxide, Ca(OH)₂. This reaction is exothermic and results in a basic solution. FeO (iron(II) oxide) and ZnO (zinc oxide) are both relatively insoluble in water. They may react slightly with water, but they don't dissolve significantly under normal conditions.

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