46.What are Rubies and Sapphires chemically known as A. silicon - TopicsExpress



          

46.What are Rubies and Sapphires chemically known as A. silicon dioxide B. aluminium oxide C. lead tetra oxide D. boron nitride 47.Acid rain contains high levels of A. oxalic acid B. acetic acid C. sulphuric and nitric acids D. carbolic acid 48.Talc contains which one of the following ? A. zinc,calcium,oxygen B. calcium,oxygen,tin C. magnesium,silicon,oxygen D. zinc,tin,sulphur 49.Which one of the following substances ismade up of only one type of atoms? A. water B. hydrogen C. milk D. air 50.Which one of the following is used as a mordant in dyeing and tanning indusrty? A. Magnesium oxide B. magnesium carbonate C. magnesium chloride D. magnesium sulphate
Posted on: Mon, 08 Jul 2013 10:36:56 +0000

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