Q38 of 61 Page 4

In what form iron is used in big buildings?

Iron in the form of steel along with cement gives reinforced concrete. This gives enough strength to big buildings.

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36 Explain the use of chlorine in water purification plants. 37 Why is aluminium used in making airplanes? 39 Why is aluminium nowadays replacing copper for use in electrical cables? 40 Why are metals, used in making machinery?