General knowledge Questions and Answers

1. What is the name of the scientist who stated that matter can be converted into energy? – Einstein
2. The isotopes of chlorine with mass number 35 and 37 exist in which ratio? – 3 : 1
3. A gas is found to have the formula (CO)n. Its vapour density is 70. What must the value of n be? – 5
4. Which law directly explains the law of conservation of mass? – Avogadro’s law
5. To whom the credit for the discovery of transuranic element goes? – Seaborg
6. How many moles are there is 140 g of Si (atomic mass of silicon is 28)? – 5
7. Which substance does not have a melting point? – Glass
8. By which a mixture of sand and naphthalene can be separated? – sublimation
9. An element X forms an oxide X03. What is the valency of X? – 6
10. Sodium carbonate crystals lose water molecules. What is this property called? – Efflorescence

11. By whom was the law of constant proportions enunciated? – Proust
12. What is the number of unpaired electrons in carbon atom? – 2
13. In an atom the order of filling up of the orbitals is governed by which principle? – Aufbau principle
14. Regarding the atom of a chemical element, magnetic quantum number refers? – Orientation
15. What are the atoms of the elements having same mass number but different atomic number called? – isobars
16. Rutherford’s scattering experiment related to the size of which thing? – nucleus
17. By whom was the absolute value of charge on electron determined? – R.A. Millikan
18. Which property of the elements is a whole number? – Atomic number
19. Discovery of the nucleus of an atom was due to the experiment carried out by which person? – Rutherford
20. What are the atoms of the elements which have same number of neutrons called? – Isotones
21. Whose experiment proved that the speed of light was always the same? – Michelson and Morley
22. Which element has two electrons in the K-shell only? – Helium
23. What is Electromagnetic radiation with maximum wavelength? – Radio waves
24. Which nuclear particles responsible for holding all nucleons together? – Mesons
25. In which process, a nucleus spontaneously breaks down by emitting radiation? – Radioactive decay
26. In atomic reactors, graphite is used as which name? – Moderator
27. Why is Cobalt-60 commonly used in radiation therapy? –Because it emits gamma rays
28. A radioactive substance has a half life of four months. Three-fourth of the substance would decay in howmany months? – 8 months
29. What is a bond formed by the transfer of electrons between atoms of the elements called? – ionic bond
30. What is a bond formed by sharing of electrons between atoms of the elements called? – covalent bond
31. What is the maximum number of hydrogen bonds in a H2O molecule? – 4
32. Select the compound in which chlorine shows oxidation state + 7? – HClO4
33. What is the oxidation of two Cl atoms in bleaching powder Ca(OCl) Cl? – +1,–1
34. What is the Oxidation state of Mn in acidic KMnO4 change from? – +7 to +2
35. Why is Molten NaCl good conductor of electricity? – Free ions
36. What is the common oxidation state of alkali metals in the combined state? – +1
37. What is the oxidation number and covalency-of sulphur in S8? – 0, 2
38. Starch iodide paper is used to test for the presence of which agent? – Oxidising agent
39. The pH of water at 25° C is 7. When it is heated to 100°C, what will the pH of water? – increases
40. When Metal carbonate reacts with dilute acids, what does it forms? – CO2
41. The element common to all the acids is known as which name? – Hydrogen
42. What is the sum of pH and pOH in aqueous solution at 25°C? – 14
43. By what factor is a solution with pH = 2 more acidic than one with pH = 6 ? – 104

44. Red litmus paper is changed into blue in solution of which thing? – Base
45. What is formed by dissolution of base or acid in water? – Exothermic
46. Blue litmus paper is converted into red in solution of which thing? – acid
47. According to Arrhenius theory of an acid and base, an acid is a substance that gives which ions in water? – H+ ions
48. What is the negative logarithmic value of hydrogen on called? – pH
49. What are the physical state of dispersion medium of a cloud ? – Gas
50. Vander Wall’s equation explains the behaviour of which gases? – real gases
51. In general gas equation, pV= nRT, V is the volume of which gas? – n mole of a gas
52. What is the ratio of rate of diffusion of oxygen and hydrogen? – 1 : 4
53. Absolute zero is the temperature where all gases are expected to have howmuch volume? – Zero volume
54. 4.4 g of CO2 contains how many litre of CO2 at STP? – 2.24 litre
55. Glucose or fructose is converted into C2H5OH in the presence of which thing? – zymase
56. Which type of materials act as effective catalysis? – Transition metals
57. What is the substance which decreases the rate of a chemical reaction? – Poison
58. TEL minimise the knocking effect when mixed with petrol, how does it act? – As negative catalyst
59. Which is the catalyst used in the manufacture of sulphuric acid by contact process? – V2O5
60. Which catalyst is sensitive to temperature changes? – Enzyme
61. Which is the temperature at which the catalytic activity of the catayist is maximum? – Optimum temperature
62. Alcoholic fermentation is brought about the action of which thing? – Yeast
63. Which is catalyst used in the Deacon’s process for the manufacture of chlorine? – CuCl2
64. In the Ostwald’s process for manufacture of HNO3, which catalyst is used? – Pt
65. Which gas has maximum colorific value? – Oil gas
66. When ammonium chloride is dissolved in water, the solution becomes cold. Whiat is change? – Endothermic
67. When ice melts into water, which type of change occurs in entropy? – Increases
68. In which type of coal percentage of carbon is the highest? – Anthracite
69. What is the mixture of carbon monoxide and nitrogen called? – Producer gas
70. What is the mixture of carbon monoxide and hydrogen called? – Water gas
71. Which law of thermodynamics introduces the concept of entropy? – Second law
72. For which element, the standard enthalpy is not zero? – C (Diamond)
73. Which fuel causes minimum environmental pollution? – Hydrogen
74. Which gas has the highest fuel value? – Hydrogen
75. The compound with negative heat of formation is known as which name? – Exothermic compound
76. Which hydrocarbon is mainly present in gobar gas? – Methane
77. What happens when the door of a refrigerator is kept open? – Room heated
78. What does the second law of thermodynamics introduced? – The concept of Entropy
79. What is an extensive property of the system? – Volume
80. A gas expands isothermally and reversible. How much work is done by the gas? – Maximum

81. About which is the information not conveyed by thermodynamics? – Rates of reactions
82. Which is the element that has the highest first ionization potential? – Nitrogen
83. What has the highest ionization potential? – Ne
84. Which of the following among alkali metals is most reactive? – Cs
85. Which is the element having lowest melting point in periodic table? – He
86. Which are the elements on the right side of the periodic table? – Non-metals
87. Which transition metal is in liquid state? – Mercury
88. Which electronic configurations exhibits metallic character? – 2, 8, 2
89. Which element has the lowest electron affinity? – Argon
90. By whom was the calculation of electronegativities first done? – Pauling
91. Which element does not exist in liquid state at room temperature ? – Na
92. What is the most electropositive amongst the alkaline earth metals? – Barium
93. Which block of elements is mostly metals with high B.P., M.P. values? – d-block
94. Which are the vertical lines in modern periodic table called? – Group
95. What is horizontal line in modern periodic table called? – Period
96. In a period, the elements are arranged in which order? – Increasing charges in the nucleus
97. Which noble gas does not have octet of electrons in its outer shell? – He
98. Which pair of elements is in the same period of the periodic table? – Na, Cl
99. Why is the electron affinity of chlorine highest than that of fluorine? – Smaller nuclear charge
100. What is the Electron affinity of noble gases? – Almost zero

General Knowledge Question and Answer Pages List :-

1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 | 71 | 72 | 73 | 74 | 75 | 76 | 77 | 78 | 79 | 80 | 81 | 82 | 83 | 84 | 85 | 86 | 87 | 88 | 89 | 90 | 91 | 92 | 93 | 94 | 95 | 96 | 97 | 98 | 99 | 100 | 101 | 102 | 103 | 104 | 105 | 106 | 107 | 108 | 109 | 110 | 111 | 112 | 113 | 114 | 115 | 116 | 117 | 118 | 119 | 120 | 121 | 122 | 123 | 124 | 125 | 126 | 127 | 128 | 129 | 130 | 131 | 132 | 133 | 134 | 135 | 136 | 137 | 138 | 139 | 140 | 141 | 142 | 143 | 144 | 145 | 146 | 147 | 148 | 149 | 150 | 151 | 152 | 153 | 154 | 155 | 156 | 157 | 158 | 159 | 160 | 161 | 162 | 163 | 164 | 165 | 166 | 167 | 168 | 169 | 170 | 171 | 172 | 173 | 174 | 175 | 176 | 177 | 178 | 179 | 180 | 181 | 182 | 183 | 184 | 185 | 186 | 187 | 188 | 189 | 190 | 191 | 192 | 193 | 194 | 195 | 196 | 197 | 198 | 199 | 200 | 201 | 202 | 203 | 204 | 205 | 206 | 207 | 208 | 209 | 210 | 211 | 212 | 213 | 214 | 215 | 216 | 217 | 218 | 219 | 220 | 221 | 222 | 223 | 224 | 225 | 226 | 227 | 228 | 229 | 230 | 231 | 232 | 233 | 234 | 235 | 236 | 237 | 238 | 239 | 240 | 241 | 242 | 243 | 244 | 245 | 246 | 247 | 248 | 249 | 250 | 251 | 252 | 253 | 254 | 255 | 256 | 257 | 258 | 259 | 260 | 261 | 262 | 263 | 264 | 265 | 266 | 267 | 268 | 269 | 270 | 271 | 272 | 273 | 274 | 275 |