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. 

– 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 .

 – Isopren