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On a school trip ot an industrial estate...

On a school trip ot an industrial estate, students found that the marble used in the office buildings has lost its shine and become pitted.
(i) What is the reaons of marble pitting?
(ii) Can this factor cause harm to vegetation as well?
Suggest methods to prevent this.

Text Solution

Verified by Experts

(i) Pitting and discolouring of marble is due to corrosive action of dry or wet acid rain, comprising sulphur dioxide and nitrogen oxides, emitted during combustion of fossil fuels in industries. The acid reacts with insoluble calcium carbonatre ofmarble and converts it into soluble calcium sulphate and calcium nitrate.
(ii) Yes. Acid rain can cause harm to vegetation by (a) direct action of acid over plants causing death of leaves. (b) solubilisation of essential minerals and their leaching leaving only toxic minerals in the soil.
(iii) Use of wet scrubbers to remove acidic gases from the industrial emission.
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