Complete the following using the correct word given in the brackets.
In the reaction `Cu(s) +2H_2SO_4 (conc.) rarr CuSO_4(aq) + 2H_2O(1) + SO_2(g)`, copper acts as _____agent. (reducing/oxidising) 

Explanation

To determine whether copper acts as a reducing agent or an oxidizing agent in the reaction

\[ \text{Cu(s) + 2H}_2\text{SO}_4 \text{(conc.)} \rightarrow \text{CuSO}_4\text{(aq) + 2H}_2\text{O(1) + SO}_2\text{(g)} \]

we need to analyze the oxidation states of the elements involved in the reaction.

### Step 1: Identify the oxidation states of copper
- In elemental form, the oxidation state of copper (Cu) is 0.
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