why food cans are coated with tin metal and not zinc metal?
In the electrochemical series, zinc is placed above the tin. This means that zinc is more reactive than tin. Due to this, zinc can react with food. But tin cannot react with food. Due to this, food can be preserved in tin containers but if you keep food in a zinc container, then food will get spoiled.
Thus, food cans are coated with tin and not with zinc because zinc is more reactive than tin