“The Knowledge Library”

Knowledge for All, without Barriers…

An Initiative by: Kausik Chakraborty.

“The Knowledge Library”

Knowledge for All, without Barriers……….
An Initiative by: Kausik Chakraborty.

The Knowledge Library

Chemistry- Questions and Answers – 20

611. Element stored in wax: 

612. Sodium and potassium are kept in:


613. Rubber is soluble in: 

Benzene (C6H6)

614. The only acid shows the characteristics of alkali is:

Boric acid 

615. The catalyst used for the production of sulphuric acid is: 

Vanadium pentoxide 

616. Diamond is Chemical: 

Pure carbon

617. The main chemical substance present in the bones and teeth of animal is: 

Calcium phosphate

618. Father of the Indian Chemical Industry:

Acharya Prafulla Chandra Ray 

619. Bosch process is used in the industrial preparation of:


620. The alloy used for making the Oscar statue: 


621. The metal is known as ‘Rainbow metal’:


622. The scientific name of Vitamin B 9 is:

Folic acid 

623. The alkali most commonly used to make bathing soap: 

Potassium hydroxide

624. Elements showing properties of both metals and non-metals:


625.  Metals & Ores

Metals & Ores 
Metals Ores
 Aluminium (Al)  Bauxite, Corundum, felspar, Cryolite, Kaolin 
Antimony (Sb) Stibnite
Barium(Ba) Barite, Witherite 
Cadmium (Cd) Greenockite
Calcium (Ca) Chalk, Quicklime, Calcite, Dolomite, Gypsum, Asbestos  
Chromium (Cr) Chromite
Copper (Cu) Malachite, Chalcocite, Chalcopyrite, Cuprite 
Gold (Au)  Quartz, Calaverite, Solvents
Iron (Fe) Hematite, Magnetite, Limonite, Copper pyrites 
Lead (Pb) Galena
Magnesium(Mg) Magnesite, Dolomite, Epsom salt, Carnalite 
Manganese(Mn) Pyrolusite
Mercury (Hg) Cinnabar 
Potassium (K) Carmelite, Sylvite, Potash
Silver (Ag) Argentite
Sodium (Na) Rock Salt, Trona, Borax
Strontium (Sr)  Strontianite, Celestine 
Tin(Sn) Cassiterite
Zinc (Zn) Zincite, Eerulinite, Calamine 
Uranium (U) Uraninite 
Tungsten (W) Wolframite, Scheelite
Nickel (Ni)  Pentlandite, Milarite
Beryllium (Be) Beryl 

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