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Q.

Which metal does not corrode easily?


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a

Gold

b

Iron

c

Aluminium

d

Zinc 

answer is A.

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Detailed Solution

Concept- A metal corrodes when it reacts with oxygen in the presence of moisture. During corrosion, an oxide layer is formed above the metal.
A more reactive metal corrodes more easily. There are certain metals that resist oxidation and corrosion in the presence of moist air. These metals are also unreactive with acid. These metals are known as noble metals. The noble metals include Ruthenium ( Ru  ), Rhodium ( Rh  ), Palladium ( Pd  ), Silver ( Ag  ), Osmium ( Os  ), Iridium ( Ir  ), Platinum ( Pt  ), and Gold ( Au  ).
Thus, Gold is a metal that does not corrode easily.
Hence, the correct option is 1.
 
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