When sodium hydroxide solution is added to copper sulphate solution, a blue precipitate of copper hydroxide is formed along with sodium sulphate solution. What kind of chemical reaction takes place between them?
Which kind of chemical reaction takes place when electric current is passed through fused lead Bromide?
(a) What happens when carbon burns in air? Write the chemical equation of the reaction which takes place. (b) Why are coal and petroleum called fossil fuels? (c) Explain how coal was formed in the earth. (d) Describe how petroleum was formed in the earth. (e) Name a fossil fuel other than coal and petroleum.