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Why is chromium often used as the OUTER plating on car parts, bath taps and bicycle handlebars?
AChromium conducts electricity better
BChromium is the cheapest of all metals
CChromium is lighter than the metal underneath
DChromium has a shiny appearance, does not corrode, and resists scratches; making the whole object out of chromium is too expensive
Answer & Solution
Correct answer: D. Chromium has a shiny appearance, does not corrode, and resists scratches; making the whole object out of chromium is too expensive
Chromium gives a hard, shiny, corrosion-resistant surface — but it is expensive. So a cheap base metal (steel, brass) is shaped into the object and only a thin chromium layer is deposited on it by electroplating, combining cost-effectiveness with desirable surface properties.
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