The table of results is shown below: (i) Salt solution Metal Copper sulphate Lead nitrate Zinc sulphate Copper No reaction seen Lead zinc Reaction seen Reaction seen No reaction seen No reaction seen Reaction seen Why is there no reaction seen when using copper metal with the solutions of lead nitrate and zinc sulphate? (1 mark) (ii) A precipitate was formed in one of the reactions. Which metal and salt solution have reacted to form the precipitate? (1 mark) (iii) (iv) Write a complete balanced equation for the precipitate that was formed. States are required. (2 marks) Explain why there was a reaction between zinc metal and a salt solution of copper sulphate. (1 mark)​