Four metals P, Q R and S are all obtained by the reduction of their oxides with carbon. Metal P is used to form a thin layer over the sheets of metal S to prevent its corrosion. Metal Q is used for electroplating tiffin boxes made of metal S whereas metal R is used in making car batteries. Metals Q and R form an alloy called solder. What are metals P, Q R and S? How have you arrived at this conclusion?
Metal P is zinc; Metal Q is tin; Metal R is lead; Metal S is iron; Metal P (zinc) is used to form a thin layer on metal S (iron) to prevent its corrosion; Metal Q (tin) is used for electroplating tiffin boxes made of metal S (iron); Metal R (lead) is used in making car batteries; Metals Q (tin) and R (lead) form an alloy called solder.