Three iron nails are placed in test tubes X , Y and Z containing water to investigate
the Sacrificial protection of iron. The iron nails are coated by a layer of metals like
Copper , magnesium and zinc respectively .in which test tube(s) the iron rust ?
a. X only b. Y only c. X and Z d. Y and Z
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Answer:
d) is the correct answer because only copper doesn't react with water
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