Question

give reason for the following


silver and copper lose their shine when exposed to air.name the substance formed on their surface in each case

tarnished copper vessels are cleaned with tamarind juice

aluminium is more reactive than iron yet there is less corrosion of aluminium as compared to iron when botyh are exposed to air

Answer 1

1st=silver and copper lose their shine because when they come in contact with air they react with oxygen and form their oxides due to which the become blakish in colour. The substance form is there oxides