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                                    1. Multiple choice questions.(u) Which one of the following industries uses limestone as a raw material.(a) Aluminium(b) Cement(c) Sugar(d) Jute1 for the public sector plants? | 
                            
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Answer»  Portlandcementconsists essentially ofcompoundsof lime (calcium oxide, CaO) mixed with silica (silicon dioxide, SiO2) and alumina (aluminum oxide, Al2O3).so Cement uses lime soda as a row material  | 
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