Important SCIENCE (CHEMISTRY ) . Gases used in welding are ? – Acetylene & Oxygen Gases used by sea divers for breathing are ? – Oxygen & Helium . Best sources for Vitamin D are? – Sunlight & Fish liver Zinc Phosphide is used as? – Rat Poison . Fuse wire is made up of – Lead and Tin Purest form of Iron is? – Wrought Iron Radium is extracted from . – Pitchblende Which agent is as ‘seed’ in artificial rain? – Silver Iodide . Oxides of metals are . – Alkaline During the process of ‘rusting’ , the weight of iron . –Increases (metal) is liquid at room temperature. – Mercury What is the formula of common salt – NaCl . What is the maximum number of electrons that a p-orbital can hold – 6 . What is used in fire extinguisher – Sodium bicarbonate What is the nature of metal oxides – Basic . Which gas burns with popping sound – Hydrogen Which metal is used for galvanization – Zinc . What is the nature of bleaching powder – Oxidising agent Which is stored in Kerosene – Sodium Phenolphthalein gives which color in acidic medium – Colorless Which gas is used in cigarette lighters? – Butane . Biogas chiefly contains . – Methane . Chemical used as fixer in Photography is . – Sodium thiosulphate Aspirin is – Acetyl Salicylic Acid is also known as ‘Stranger Gas.’ – Xenon Natural rubber is a polymer derived from . – Isoprene 46 views09:15
