Q34 of 400 Page 192

Give reason why copper is used to make hot water tanks but steel (an alloy of iron) is not.

copper is used to make hot water tanks but steel (an alloy of iron) is not because Copper does not corrode easily in the presence of water but steel rusts in the presence of water.

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32 What is a thermite reaction? Explain with the help of an equation. State one use of this reaction. 33 Which one of the methods given in column I is applied for the extraction of each of the metals given in column II:

Column I


(i) Electrolytic reduction


(ii) Reduction with Carbon


(iii) Reduction with Aluminium


Column II


(a) Aluminium


(b) Zinc


(c) Sodium


(d) Iron


(e) Manganese


(f) Tin

 34 Explain why, the surface of some metals acquires a dull appearance when exposed to air for a long time. 35 Why does aluminium not corrode right through?