✔️Important SCIENCE (CHEMISTRY )

 ✔️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. – Gallium 

✅ 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