Metals react with dil. sulphuric acid to give metal sulphates and hydrogen gas.For example,$\mathrm{Zn(s)} + \mathrm{H}_2\mathrm{SO}_4\mathrm{(aq)} \rightarrow \mathrm{ZnSO}_4\mathrm{(aq)} + \underset{\; \text{(Hydrogen gas)}}{\mathrm{H}_2 \uparrow}$ Test for hydrogen gas : Take about $5\ \mathrm{ml}$ of dilute sulphuric acid in a test tube and add a few pieces of zinc granules to it. Hydrogen gas is evolved which forms bubbles in the soap solution.Bring a burning candle near hydrogen gasfilled bubble. It burns with a pop sound.