18. When metal is placed in open atmosphere for a long time following is observed except?
(A) Iron articles get a coat ofreddish brown powder (B) Gold articles get a coat of black powder
(C) Silver articles get a coat ofblack powder (D) Copper articles get a coat of green powder
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B) Gold articles get a coat of black powder
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Answer:
a) iron articles get a reddish brown coat due to the phenomenon of rusting. when kept in open , it is exposed to both humidity and air (oxygen) thus, it reacts with them to form iron(III) oxide or what we commonly call rust.
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