Staff Selection Commission (SSC) General Science (Chemistry) Question Paper 2015
Sunday, July 26, 2015
General Science (Chemistry) Practice Questions
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? – 610. Sodium carbonate crystals lose water
molecules. What is this property called? – Efflorescence
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