you Today, let us study the heating of lead nitrate in air. On heating, lead nitrate dissociates to form lead oxide, nitrogen dioxide and oxygen. To conduct this experiment, we need the following materials. Spatula, test tubes, test tube holder, lead nitrate and candle. We can also use spirit lamp. Let us first light the candle. Take a test tube and add one or two spatula of lead nitrate to it. Now hold it with the help of a test tube holder and heat it over the flame. Observe it carefully. Care should be taken to keep the mouth of the test tube away from your face to avoid the fumes. On heating, lead nitrate produces a crackling sound along with the brown fumes of nitrogen dioxide. Let us burn the splinter and introduce this glowing splinter into the test tube. The splinter gets realed again. Because from this experiment, we infer that on heating lead nitrate, brown fumes of nitrogen dioxide is evolved along with the crackling sound. The fact that the glowing splinter gets realed indicates the evolution of oxygen. Hence, it is a decomposition reaction.