61.What is the chemical name for marble? A. Potassium nitrate B. - TopicsExpress

61.What is the chemical name for marble? A. Potassium nitrate B. Calcium carbonate C. Titanium dioxide D. Calcium bicarbonate 62.Which of the following metals is in liquid state at normal room temperature? A. Gallium B. Radon C. Silicon D. Sodium 63.The chemical name of bauxite is A. Aluminium oxide B. Aluminium chloride C. Aluminium sulphite D. Hydrated aluminium oxide 64.Which of the following is the hardest element? A. Copper B. Diamond C. Iron D. Silicon 65.Biogas mainly contains A. Oxygen B. Carbon dioxide C. Methane D. Nitrogen

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