Question

to identify the type of reaction by studying the reaction and recording the observations
1.combustion of magnesium in air
2.action of dil.sulphuric acid on zinc
3.To heat lead nitrate​

Answer 1

1. combustion/combination reaction.

magnesium burns in air with a dazzling white flame and a white powdery substance is formed.

2. displacement reaction.

zinc chloride is formed with evolution of a colourless and odourless hydrogen gas.

3. thermal decomposition reaction.

lead oxide yellow solid is formed along with evolution of brown fumes of nitrogen dioxide and oxygen gas.