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

hintHint:

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, CO cannot be formed as the oxidation states are not balanced.

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