Objective Questions In Chemistry – General Science Materials For Competitive Examinations Part 1
1. Zinc is not present in bronze
2. Dynamite was invented by Nobel
3. Periodic table was given by Mendeleev
4. Reduction is addition of Hydrogen.
5.Oxidation is addition of Oxygen.
5. The galvanized iron pipes are coated with zinc.
8. Non-stick kitchenwares are coated with Teflon.
9. Gobar gas mainly contains methane.
10. The chief constituent of vinegar is acetic acid.
11. The fibre least prone to catch fire is cotton.
12. Setting of plaster of paris involves dehydration process.
13. The chemical name for the compound having formula NaOH is sodium hydroxide.
14. Helium gas is filled in balloons because it is lighter than air.
17. What happens to the equivalent conductance of an electrolyte on dilution? may increase or decrease depending on the electrolyte
19. Cotton fibre is made up of cellulose.
20. Protein metabolism is carried out by Vitamin B2.
21. The first insecticide produced in India is DDT.
22. Piezo-electric effect is exhibited by quartz.
23. Isotopes have the same atomic number.
24. Lunar caustic is silver nitrate(AgNO3).
25. Which of the following is true? all ores are minerals
26. The colourless gas with the smell of rotten fish is PH3
27. The fungicide Bordeaux mixture consists of boric acid and calcium hydroxide
28. The substance used in the manufacture of high voltage insulators is silicons
29. Tobacco is preserved from drying out in glycerol
31. Which one of the following is incorrectly matched? Basic salt – Cu (OH)NO3
32. Natural rubber is a polymer derived from isoprene
33. Butane dioic acid is adipic acid
34. Carborandum is SiC
35. 20ca40 and 19k40 are isotones
36. Epsom salt is MgSo4.7H2O
37. Which one of the following is an explosive? Trinitro toluene
38. The number of ions produced from one molecule of K4Fe(CN)6 in aqueous solution is 5
39. The formula which is used to calculate the maximum number of electrons in the principle quantum number is 2n2
40. Trimethyl benzene is called mesitylene
41. The formula of plaster of paris is
CaS04 H2O
42. A white powder insoluble in water dissolves in ammonium hydroxide. It could be silver chloride
43. Mass number of an element represents number of protons and neutrons
45. The commonly used refrigerant in fridges is freons
48. Sodium thiosulphate is widely used in photography. Its main role in photographic process is due to reduction
49. If the percentage of oxygen in a metallic oxide is 33.33%, then its equivalent mass is 16
50. In nature borax occurs as Tincal
