A solution of potassium iodide is added to a solution of lead nitrate taken in a test tube. What type of reaction is this? 

A solution of potassium iodide is added to a solution of lead nitrate taken in a test tube. Write a balanced equation to represent the reaction. 

When lead nitrate powder is heated, which colour fumes are evolved? Also, name the gas evolved. 

State three applications of a decomposition reaction. 

With the help of an activity, show that the reaction between calcium oxide (lime) and water is an exothermic reaction. 

When a metal rod is immersed in an aqueous copper sulphate solution, the blue colour of the solution changes to pale green. What is the metal with which the rod is made up of?