100 important chemistry questions

100 Important Chemistry Questions For SSC and RRB Exams in 2019

S Now Question Answers
1. Tube light is filled with? Mercury Vapour & Argon
2. Other name of “FOOL’S GOLD” is? Iron Pyrite
3. Non-stick coating in utensils is of? TEFLON
4. Compounds responsible for temporary hardness of water? Bicarbonates of Calcium

and Magnesium

5. Compounds responsible for permanent hardness of water? Sulphates and Chlorides of

Calcium and Magnesium

6. Gases used for ripening raw fruits? Ethylene & Acetylene
7. Main ore of Mercury is? Cinnabar
8. Egg shell is made up of? Calcium Carbonate
9.     is known as Artificial Silk. Reyon
10. Water soluble Vitamins B & C
11. Fat Soluble Vitamins A, D, E & K
12. Common preservative in food processing industry is? Benzoic Acid
13. First organic compound synthesized in laboratory & by whom? Urea by Friedrich Wöhler
14. What blackens silver’s shine? Ozone Gas
15. Substance used in Cancer treatment? Cobalt – 60
16. Cobalt is found in? Vitamin B12
17. Iron is extracted from which ore? Hematite
18. Aluminum is extracted from which ore? Bauxite
19. Copper is extracted from which ore? Copper Pyrite
20. Chemical name of ‘Washing Soda’ is? Sodium Carbonate
21. Gases used in welding are     ? Acetylene & Oxygen
22. Gases used by sea divers for breathing are     ? Oxygen & Helium
23. Best sources for Vitamin D are? Sunlight & Fish liver
24. Zinc Phosphide is used as? Rat Poison
25. Fuse wire is made up of      Lead and Tin
26. Purest form of Iron is? Wrought Iron
27. Radium is extracted from     . Pitchblende
28. Which agent is as ‘seed’ in artificial rain? Silver Iodide
29. Oxides of metals are     . Alkaline
30. During the process of ‘rusting’ , the weight of iron     . Increases
31.     (metal) is liquid at room temperature. Gallium
32.     is used to prepare fire proof and water proof clothes. Calcium hydride
33. Galvanised iron is coated with? Zinc
34. Chemical name of Chromic Acid is? Chromium trioxide
35. Which metal is used in Photoelectric cell? Selenium
36. Barium Hydroxide is also known as? Baryta Water
37.     elements are non-metal. Electronegative
38.     is known as heavy water and used in nuclear reactor as


Deuterium Oxide (D2O)
39. Deuterium is     of Hydrogen. Isotope
40. Ozone is     of Oxygen. Allotrope
41. Ammonia (NH3) is synthesized through? Haber’s Process
42. Chlorine is used to prepare      PVC, Insecticides,herbicides



43. Which catalyst is used for the synthesis of Vanaspati Ghee? Nickle (Ni)
44. Which catalyst is used for the synthesis of Sulphuric Acid by Contact


Platinum (Pt)
45. Chemical name of Picric Acid is? Tri Nitro Phenol
46.     is known as laughing gas? N2O
47. Chloroform in sunlight forms poisonous gas     . Phosgene
48. Platinum is also called     . White Gold
49. Which material is used in making of safety matches? Red Phosphorous
50. Nail polish remover contains? Acetone
51. Which acid is present in Orange? Citric Acid
52. Lead pencil contains     . Graphite
53. Which gas is used in filling electric bulbs     ? Argon
54. Lightest metal? Lithium
55. Acid rain is due to air pollution by? Nitrous Oxide & Sulphur


56. Ozone is     . Diamagnetic
57. Petroleum is found in     . Sedimentary Rocks
58. All noble gases are? Colourless and Odourless
59. The most abundant element in the earth’s crust is ? Oxygen
60. The lustre of a metal is due to     . Presence of free electrons
61. Which gas is used in fire extinguisher? Carbon dioxide
62. Which gas is used in cigarette lighters? Butane
63. Biogas chiefly contains     . Methane
64. Chemical used as fixer in Photography is     . Sodium thiosulphate
65. Aspirin is     . Acetyl Salicylic Acid
66.     is also known as ‘Stranger Gas.’ Xenon
67. Natural rubber is a polymer derived from     . Isoprene
68. ‘Oil of Vitriol’ is     . Sulphuric acid
69. Paper is chemically     . Cellulose
70. Impurity present in ore is     . Gangue
71. Which is known as ‘Metal of Future’ ? Titanium
72. Efficiency of the catalyst depends on its? Molecular State
73. Most of the explosions in mines occurs due to mixing of     . Methane with air
74. Vinegar is an aqueous solution of     . Acetic acid
75. Kerosene is a mixture of     . Aliphatic hydrocarbons
76. The important metal used with iron to produce stainless steel is     . Chromium
77. Which gas is responsible for the swelling of bread? Carbon dioxide
78. The metal constituent of chlorophyll is     . Magnesium
79. Which acid is used for etching glass? Hydrofluoric acid (HF)
80. Paraffin wax is     . Saturated hydrocarbon
81. Solder is an alloy of     . Tin and Lead
82. Alum is used as A purifier for water
83. Nuclear fuel in the sun is     . Helium
84. Dead organisms are transformed into petroleum and natural gas     . Absence of air
85. Organic Compounds are only soluble in     . Non-polar solvents



86. Which acid is used in soft drinks? Carbonic acid (H2CO3)
87. Which acid is present in Bee Sting? Methanoic Acid
88. Tooth enamel is made up of     . Calcium Phosphate
89. The name ‘catalyst’ was given by     . Berzilius
90. A polymeric substance used to make parachute is     . Viscose
91. What is used to avoid melting of ice? Gelatine
92. Carbon occur in the nature in the purest form as? Diamond
93. Oxidation is defined as —– Loss of electrons
94. In nuclear reactor, chain reaction is controlled by using     . Cadmium rod
95. The radioactive element most commonly detected in humans is     . Potassium – 40
96. Hydrogen bomb is based on the principle of     . Nuclear fusion
97. The ultrapure metal is obtained by     . Zone refining
98. Most abundant metal in earth’s crust is     . Aluminium
99. Balloons are filled with     . Helium
100 The element common to all acids is     . Hydrogen

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