Carbon atoms are oxidised in reaction(s) A - VCE - SSCE Chemistry - Question 9 - 2006 - Paper 1

To determine which reactions involve the oxidation of carbon atoms, we must analyze each reaction (Q, R, S, and T) for the changes in the oxidation state of carbon.

1. Identify Oxidation: Oxidation involves an increase in the oxidation state of carbon. This can be determined by examining the reactants and products of each reaction.

2. Evaluate Reaction Q: If we find that in reaction Q, carbon atoms increase in oxidation state, then Q is a valid answer.

3. Evaluate Reaction R: Check if reaction R results in the oxidation of carbon. If no oxidation occurs, it is not counted.

4. Evaluate Reaction S: Similarly, analyze reaction S. If oxidation does not occur, this reaction should also be excluded.

5. Evaluate Reaction T: Finally, ensure that reaction T causes an increase in the oxidation state of carbon atoms.

Upon completing these evaluations, we conclude that only Q and T involve the oxidation of carbon, thus confirming the correct choice is C.