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    Chemistry
    Grade-6
    Easy

    Question

    When carbon and oxygen combine, they form which compound?

    1. CO2
    2. CaCO3
    3. CO3
    4. Both A and C

    Hint:

    Any element when combined with oxygen it forms its oxide.

    The correct answer is: Both A and C

      • Any element when combined with oxygen it forms its oxide.
      • When carbon and oxygen combine it forms two oxides carbon monoxide and carbon dioxide.
      • Whether carbon dioxide or monoxide is formed depends on the weight ratio they combine.
      • When a compound is formed its charges should be balanced. Hence, CO3  cannot be formed as the oxidation states are not balanced.

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