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Q.

Metals like aluminium, iron and zinc do not react with-

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a

cold water

b

both cold and hot water

c

hot water

d

steam

answer is D.

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Detailed Solution

Metals like aluminium, iron and zinc do not react either with cold or hot water, because these metals form a tough protective layer of metal oxides on their surface. This metal oxide layer prevents further reaction. Steam can break the protective layer of existing oxides so they react with steam to form new metal oxide and hydrogen.

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