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6) two conditions which promotes corrosion are:- (i) when metal is kept in atmosphere it react with oxygen and hence corrosion form.
(ii) when metal react with any acid or any element such as hydrogen then also corrosion happens.
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(ii) when metal react with any acid or any element such as hydrogen then also corrosion happens.
hey user you are 7th question is is not clear so it's difficult to answer that I am sorry.
hope the 6th one helped u mark me as brainlist or follow me..
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