Chemistry
Que No 1. In addition to acid , another acid which may render iron passive is -
Ans : Chromic acid .
Que No 2. Ferrous sulphate solution absords -
Ans : Nitric Oxide ( No ).
Que No 3. spetter is -
Ans : Impure zn.
Que No 4. Invar , Used for making pendulums is an alloy of steel with -
Ans : Nickel.
Que No 5. Sindur is a sacred material of the Hindus . It is a compound of -
Ans : Lead .
Que No 6. The modern method of production of synthetic petrol is -
Ans : Fischer-Tropsch process .
Que No 7. Apart from lead tetraethyl , the other compound used as antiknock is -
Ans : Iso-octane .
Que No 8. An essential condition for rusting is -
Ans : Moisture .
Que No 9. Petroleum ether is also know as -
Ans : Lubricating oil , Naphtha .
Que No 10. Drinking soda is -
Ans : Acidic in nature .
Que No 11. The main chemical substance present in the bones and teeth of an animal is -
Ans : Calcium phosphate .
Que No 12. The ore of iron is -
Ans : Magnetite and red haematite .
Que No 13. Deficiency of iron causes-
Ans : Anaemia .
Que No 14. Isoprene is -
Ans : Natural Rubber .
Que No 15. Frothfloatation process is adopted for-
Ans : Sulphide ores .
Que No 16. Heavy Water-
Ans : Contains deuterium in place of hydrogen .
Que No 17. White lead is -
Ans : A Basic Salt.
Que No 18. A pyrex tumbler does not crack when hot water is poured into it , because pyrex-
Ans : Does not expand much on heating .
Que No 19. Diamond is harder than graphite because of the -
Ans : Tetrahedral structure of diamond .
Que No 20. The number of molecules of the water of hydration blue vitriol is -
Ans : 5 .
Que No 21. Tincture iodine is a solution of -
Ans : Iodine in alcohol.
Que No 22. The nobel gas which is present in microscopic quantities in air is -
Ans : Xenon .
Que No 23. Water has a maximum density at -
Ans : 277k.
Que No 24. Pyrene is the commercial name for -
Ans : Carbon tetrachloride .
Que No 25. Solder , which is used for soldering metal pieces , is an alloy of -
Ans : Tin and lead
Que No 26. Gases have -
Ans : Neither definite volume nor Shape .
Que No 27. An elemant whose position is anomalous in the periodic table is -
Ans : Hydrogen .
Que No 28. The neutron was discovered by -
Ans : Chadwick .
Que No 29. Atomicity of ozone is -
Ans : 3.
Que No 30. Radium was isolated from -
Ans : pitchblende .
Que No 31. The law of octaves was stated by -
Ans : J.A.R New Lands .
Que No 32. The modem System of Symbols was evolved by :
Ans : Berzelius .
Que No 33. A mixture of Naphthalene and sand is separeted by-
Ans : Sublimation .
Que No 34. PVC is obtained by the polymerisation of -
Ans : Vinyal Chloride .
Que No 35. With 10-12 percent chromium , iron forms very well know alloy steel called -
Ans : Stainless steel .
Que No 36. Brimstone Stands for -
Ans : Sulphur .
Que No 37. Who discovered Isotopes -
Ans : Soddy.
Que No 38. Collapsable tube of a tooth paste is made up of -
Ans : Aluminium .
Que No 39. Oxygen is best absorbed by -
Ans : Alkaline Pyrogallate .
Que No 40. The commonest ore of aluminium is -
Ans : Bauxite .
Que No 41. The metal which evolves hydrogen with sodium hydroxide and with acid is -
Ans : Zinc .
Que No 42. A metal Which occurs ' Free ' in nature is -
Ans : Gold .
Que No 43. A metal which is purified by zone refining is -
Ans : Si / Ge / Ga .
Que No 44. Calomel is -
Ans : Mercurous chloride .
Que No 45. An acid which is used as a preservative for pickles is -
Ans : Acetic acid .
Que No 46. The percentage of silver in German silver is -
Ans : Zero .
Que No 47. The iron salt used in blue black ink -
Ans : Ferrous sulphate .
Que No 48. The extraction of iron from its oxide ore involves -
Ans : Reduction .
Que No 49. A pungent smell often present near the urinals is due to -
Ans : Amonia .
Que No 50. Solvay process is not suitable for the manufacture of potassium carbonate because-
Ans : Potassium bicarbonate is very soluble .
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