Final answer:
When heating Copper and conc H2SO4 are passed through water, a chemical reaction occurs and produces hydrogen gas (H2).
Step-by-step explanation:
When a gas obtained by heating Copper and conc H2SO4 is passed through water, a chemical reaction occurs. The gas produced is hydrogen gas (H2), which is released as bubbles. The reaction can be represented by the equation:
Cu + H2SO4 → CuSO4 + H2
Water is a reactant in this reaction because it provides the oxygen needed to react with copper and sulfuric acid. It also acts as a solvent for the reaction, allowing the gas to be evolved as bubbles.