CHEMISTRY - GENERAL QUESTIONS ASKED IN COMPETITIVE EXAMS

1. Which acid is produced when milk gets sour? - LACTIC ACID
2. Periodic table was given by - MENDELEEF
3. First atomic theory was proposed by - JOHN DALTON
4. The alloy of aluminium used for making magnet is - ALNICO
5. Nucleus of an atom contains - PROTONS & NEUTRONS
6. Rare gases are - DI ATOMIC GASES
7. Which synthetic fibre is known as artificial silk? - RAYON
8. Bleaching powder contains - CHLORINE
9.  DDT is an - INSECTICIDE
10. DDT means - DI-CHLORO DI-PHENYL TRI-CHLORO ETHANE
11. Water drops are spherical because of - SURFACE TENSION
12. Which one is also called Stranger Gas - XENON GAS
13. Nail polish remover contains - ACETONE
14. The element used in lead pencils is - CARBON
15. Aluminium oxide is an - AMPHOTERIC ACID
16. Epsom salt is chemically known as - MAGNESIUM SULPHATE
17. Homo nuclear molecules contain - COVALENT BOND
18. pH of blood is - 7.4
19.  Human bone does not contain - OXYGEN
20. Natural rubber is a polymer derived from - ISOPERENE
21. The concept of an electrolyte in water was described by - ARRHENIUS
22. The isotope atoms differ in - ATOMIC WEIGHT
23. Which  gase is readily soluble in water at room temperature? - CARBON DIOXIDE
24. The solute in a solution can be separated by - EVAPORATION
25. Bauxite is an ore of - ALUMINIUM
26. Ruby is an oxide of - ALUMINIUM
27. The term PVC used in the plastic industry stands for - POLY VINYL CHLORIDE
28.  The alcohol used in the preparation of dynamite is - GLYCEROL
29. The chemical used as a fixer in photography is - SODIUM THIYO SULPHATE
30. Which one does not contain silver by its property ? GERMAN SILVER
31.  The concept of ellipitical orbitals was suggested by - SOMMERFELD
32. Tobacco is preserved from drying out in - GLYCEROL (ALCOHOL)
33. The alcohol used in power alcohol is - ETHYL ALCOHOL
34. pH of good quality drinking water is - 7.00
35. What is a mixture of potassium , nitrate powdered charcoal and sulphur called? - GUN POWDER
36. Washing soda is - SODIUM CARBONATE
37. Bleaching action of chlorine is by - DECOMPOSITION
38. Air contains maximum amount of - NITROGEN
39. Which is used to produce artificial rain? - SILVER IODIDE
40. The reaction between methane and chlorine in diffused sunlight is - SUBSTITUTION
41. Which one is the softest chemical ? - SODIUM
42. Which substance is obtained by the hydrolysis of oil? - GLYCEROL (ALCOHOL)
43. Which variety of glass is heat resistant? - PYREX GLASS
44. Which is the heaviest metal? - MERCURY
45. Normal valency of nitrogen is - 3
46. Radon is an - INERT GAS
47. Gases which doesnot undergo any chemical reactions under set of conditions are called  - INERT GAS
48. The acid present in lemon is - CITRIC ACID
49. Oil of vitriol is - SULPHURIC ACID
50. Aspirin is - METHYL SALICYLATE
51. Calcium sulphate is known as - GYPSUM SALT