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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? - Science

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?

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Solution

Metal P is Zn (zinc), Q is Sn (tin), R is Pb (lead) and S is Fe (iron).

We arrive to the following conclusion:

Metal P (zinc) is used to form a thin layer on metal S (iron). The process of thin coating of zinc layer on iron objects is called galvanisation. This thin coating of zinc layer on iron objects protects it from corrosion (zinc is a highly reactive metal. It does not rust even in moisture because it forms a thin coat of zinc oxide on reacting with air). 

Metal Q (tin) is used for electroplating tiffin boxes made of metal S (iron). This tin coating prevents the corrosion of iron. However, tin coating provides only outside protection.

Metal R (lead) is used in making car batteries. Metal Q (tin) and metal R (lead) are combined together to form an alloy called solder.

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Lakhmir Singh Class 10 Chemistry (Science)
Chapter 3 Metals and Non-metals
Q 98 | Page 196
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