FUTURE VISION STUDY CENTRE - SALEM
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TNPSC – GR – I (PRELIMS) - 2020
SUBJECT / TOPICS : CHEMISTRY
Elements and Compounds, Acids, Bases & Salts,
Petroleum Products, Fertilizers, Pesticides
TIME: 1Hour
MARKS: 100
1. In the nucleus of 20Ca40, there are _________
A) 20 Protons and 40 neutrons B) 20 Protons and 20 neutrons
C) 20 Protons and 40 electrons D) 40 Protons and 20 electrons
2. 1 mole of any substance contains _______ molecules
A) 6.023 x 1023 B) 6.023 x 10-23 C) 3.0115 x 1023
D) 12.046 x 1023
3. The sum of the no. of protons and neutrons of an atom is called its _________
A) nucleus B) Atomic number C) Mass number D) Relative atomic mass
4. B10 & B11 are called ________
A) Isotopes B) Isobars C) Isotones D) Isomers
5. An example of triatomic molecule is ________
A) Ozone B) Nitrogen C) Hydrogen D) Ammonia
6. The no.of Periods and groups in the periodic table are _______
A) 6, 16 B) 7, 17 C) 7, 18 D) 8, 18
7. The basis of modern periodic law is
A) Atomic mass B) Atomic number C) Isotopic mass D) Number of neutron
FUTURE VISION STUDY CENTRE
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ndFloor, Avk Maruthi Plaza, Opp: Hotel Lakshmi Prakash,
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FUTURE VISION STUDY CENTRE - SALEM
CONTACT : 90420 30163
8. Which of the following have inert gases 2 electrons in the outermost shell?
A) He B) Ne C) Ar D) Kr
9. Neon shows zero electron affinity due to
A) Stable arrangement of neutrons B) Stable configuration of electrons
C) Reduced size D) Increased density
10. _______ is an important metal to form an amalgam
A) Ag B) Hg C) Mg D) Al
11. ______ is stored in kerosene
A) Iron B) Silver C) Sodium D) Aluminium
12. Which one of the following is used for making pressure cookers?
A) Brass B) Magnalium C) Duralumin D) Nickel steel
13. Which one of the following does not react with copper?
A) Oxygen B) Conc. H2SO4 C) NaOH D) Conc.HNO3
14. The highest ionization energy is exhibited by _________
A) Halogens B) Alkaline C) Transition metals D) Noble gases
15. Which of the following are used as anaesthetics?
A) Carboxylic acids B) Ethers C) Esters D) Aldehydes
16. Lower hydrocarbons are ______ state at room temperature
A) Solid B) Liquid C) Gaseous D) Viscous
17. Which one of the following has sour in taste?
A) Ethanol B) Ethanoic acid C) Ethanal D) Ethyne
18. ______ group contains the member of the halogen family.
A) 17th B) 15th C) 18th D) 16th
19. Hand sanitizers contain _______
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20. Power alcohol is a mixture of _______
A) Ethanol + Methane B) Ethanol + Water C) Ethanol + Petrol D) Ethanol + Pyridine
21. ________ compounds hold the key to plant and animal life on the earth
A) Sulphur B) Carbon C) Nitrogen D) Born
22. The rectified spirit contains _________
A) 100% ethanol B) 50% ethanol + 50% water
C) 95.5% ethanol and 4.5% water D) Ethanol + Pyridine
23. Which reagent is used to identify alcohol consumed persons?
A) CH3COOH B) CaO C) K2Cr2O7 D) H2SO4
24. The alcohol that is poisonous in nature is _______
A) Methanol B) Ethanol C) Phenol D) Benzyl alcohol
25. A solution has a pOHof 11.76. what is the pH of of this solution?
A) 3.15 B) 2.24 C) 1.72 D) 4.78
26. The pH of a solution is 3. Its [OH-] concentration is __________
A) 1 x 10-3 M B) 3 M C) 1 x 10-11M D) 11M
27. What is the relationship between PH and POH?
A) PH – POH = 14 B) PH / POH = 14 C) PH + POH = 1.4 D) PH + POH = 14
28. In agriculture, the nature of the soil for rice is ________
A) Alkaline B) Neutral C) Acidic D) None of these
29. Silver anklet has got tarnished due to the formation of _______
A) Ag2O B) Ag2S C) AgBr D) AgNO3
30. The chemical used in white washing on the walls is ______
FUTURE VISION STUDY CENTRE - SALEM
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31. Which metals do not liberate gas on reaction with acids?
A) Zn, Mg B) Ag, Cu C) Na, K D) Cr, Al
32. The PH of stomach fluid is __________
A) 12 B) 14 C) 3 D) 2
33. Sugarcane requires ______ soil
A) Acidic B) Alkaline C) Neutral D) Amphoteric
34. Which of the following element has zero electron affinity?
A) Fluorine B) Chlorine C) Argon D) Bromine
35. The shortest Period Contains Elements
A) H, He B) Li, Be C) B, C D) H, Li
36. The longest form of periodic table was constructed by
A) Dmitri Mendeleev B) Henry Moseley C) Lothar Meyer D) New lands
37. Which period mostly include man made radioactive elements?
A) 4th Period B) 7th Period C) 6th Period D) 3rd period
38. Group 16 constitutes family
A) Halogen B) Noble gas C) Chalcogen D) Alkalimetals
39. What will be the change in valency down the group in the periodic table?
A) Increases B) Decreases C) Remains same D) Zero
40. Group numbers 3 to 12 in the periodic table are called ________
A) Inner transition elements B) Synthetic elements
C) Representative elements D) Transition elements
41. Which one of the following is in solid state at room temperature?
A) Bromine B) Mercury C) Bismuth D) Gallium
42. Which of the following is not a metalloid or semi-metal?
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43. Which one of the following is not an isoelectronic ion?
A) Na+ B) Mg2+ C) Cl- D) O
2-44. Which one of the following have zero electron gain enthalpy?
A) Halogens B) Noble gases C) Chalcogens D) Gold
45. Which one of the following is fuel for home and industry?
A) LPG B) Petrol C) Diesel D) Bitumen
46. The chemical mixed with LPG that helps in the detection of its leakage is _________
A) Methanol B) Ethanol C) Camphor D) Mercapton
47. Which is known as syn gas?
A) Marsh gas B) Water gas C) Producer gas D) Coal gas
48. __________ is the coal of superior quality
A) Peat B) Lignite C) Bituminous D) Anthracite
49. __________ is a mixture of methane and carbondioxide.
A) Water gas B) Coal gas C) Bio gas D) None
50. Which one of the following is also called as Sindri fertilizer?
A) Natural fertilizer B) Mixed fertilizer
C) Ammonium Sulphate D) Urea
51. Expansion of DDT is _________
A) Dichloro Diphenyl Trichloro ethane B) Dimethyl Dichloro Trichloro ethane
C) Dichloro Diphenyl Tetra Chloroethane D) Dichloro Diphenyl Trichloro ethylene
52. The elements present in the vertical column of the periodic table is called as
A) Period B) Group C) Block D) Transition elements
53. What is the chemical name of sand?
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54. Plaster of Paris is ________
A) CaSO4.H2O B) CaSO4. ½ H2O C) CaSO4.2H2O D) CaSO4. 3/2 H2O
55. Marble contains
A) ZnCO3 B) CaCO3 C) MgCO3 D) K2CO3
56. Bacteria convert molecular nitrogen into which of the following?
A) HNO3 B) Amino acids C) NO2 D) NH3
57. Which one of the following hybridisation is present in PCl5 molecule?
A) Sp3d2 B) Sp3d C) Sp3 D) Sp2
58. The first insecticide produced in India is
A) DDT B) BHC C) Parathion D) Chloral
59. DDT is an
A) Insecticide B) Explosives C) Antibiotic D) Enzyme
60. The essential elements required for the proper growth of the plant are
A) Ca, Mg, Sr B) H2, N2, O2 C) Cu, Ag, Au D) N, P, K
61. Find the odd one out
A) PVC B) Nylon C) Terrylene D) DDT
62. Gammexane is the trade name of
A) BHC B) DDT C) Urea D) Detergent
63. The element that shows maximum catenation is
A) Si B) C C) Pb D) Sn
64. The element used in lead pencils is
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65. The PH of a neutral solution is
A) 0 B) 6 C) 7 D) 14
66. If PH = 7, POH = __________
A) Zero B) 7 C) 14 D) None of these
67. The acid present in milk is known as
A) Citric acid B) Acetic acid C) Lactic acid D) Butyric acid
68. The acid present in vinegar is
A) CH3COOH B) H2SO4 C) HCl D) HNO3
69. In the periodic table, the elements present in the groups from 1 to 2 are known as
A) p – block elements B) d – block elements
C) f – block elements D) s – block elements
70. In the modern periodic table elements are classified on the basis of
A) Atomic number B) Atomic weight C) Valency D) Atomic size
71. The hydroxyl ion concentration of a solution is 1 x 10-9 M. What is the POH of the solution?
A) 3 B) 8 C) 9 D) 5
72. The mixture present in the pencil lead is
A) Carbon and Nitrogen B) Carbon & Oxygen
C) Carbon and Clay D) Carbon & Glass
73. Which acid is called king of chemicals?
A) Sulphuric acid B) Hydrochloric acid C) Nitric acid D) Citric acid
74. The Epsom salt which is used to laxative is
A) CaSO4.2H2O B) ZnSO4.5H2O C) CuSO4.5H2O D) MgSO4.7H2O
75. Which one of the following is the composition of Brass?
A) Cu – 50%, Sn – 50% B) Cu – 60%, Zn – 40%
FUTURE VISION STUDY CENTRE - SALEM
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76. Galena is the ore of which of the following metals?
A) Silver B) Lead C) Gold D) Iron
77. The acid rain destroys the vegetation, because it contains
A) Nitrates B) Ozone C) Carbon Monoxide D) Sulphuric Acid
78. What is the covalency of nitrogen in ammonia molecule?
A) 2 B) 4 C) 3 D) 5
79. Which one of the organic pesticides that contain phosphorous?
A) DDT B) BHC C) 2, 4 - D D) Parathion
80. The main constituent of steel in India are
A) Ni & Cu B) Mn & Cr C) Fe & Cu D) Ti & Cr
81. The Indian Salt petre is
A) NH4NO3 B) NaNO3 C) KNO3 D) Ca(NO3)2
82. Nitrous Oxide is known as laughing gas It is also used in medical field as
A) Instant horse power B) Propellant C) Antiseptic D) Anaesthetic
83. Which of the following is strong acid and strong base reaction?
A) HCOOH + NH3 B) HCOOH + NaOH
C) HCl + NH3 D) HCl + NaOH
84. Which is used as a power source in long mission space probes?
A) U - 235 B) U - 232 C) Pu - 238 D) Pu - 241
85. Which one is used as fuel in Nuclear reaction in power plants?
A) 92U235 B) 92U236 C) 92U239 D) 92U234
86. Which one of the following is used in making ointment for curing skin diseases?
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87. Which of the following Noble gas is used for inflating aeroplane tyres?
A) Neon B) Argon C) Helium D) Xenon
88. Fog is a colloidal solution of
A) Gas in Liquid B) Liquid in gas C) Gas in Solid D) Solid in gas
89. An ester used as medicine is
A) ethyl acetate B) ethyl benzoate C) methyl salicylate D) Methyl benzoate
90. Atoms having equal number of neutrons but differing in mass numbers are called as
A) isotopes B) isobars C) isomers D) isotones
91. Which gas has not been transported by blood?
A) Oxygen B) Carbondi Oxide C) A & B D) Nitrogen
92. The ozone deflation is mainly caused by the gas
A) CFCs B) SO2 C) Na2 D) CO2
93. The compound which is called ‘common salt’ is
A) NaCl B) CaCl2 C) AlCl3 D) LiCl
94. Among the following which one is not a biofertilizer?
A) Anabaena B) Nostoc C) Lindane D) Rhizobium
95. Rainwater helps to increase the ________ of the soil
A) Phosphorous Content B) Nitrogen Content
C) Calcium Content D) Potash Content
96. Copper Sulphate is used as
A) Food Preservative B) Fungicide C) Mordant D) Reducing agent
97. Which of the following is a balanced source of plant nutrient?
A) Urea B) Ammonium Sulphate
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98. Tomato is a natural source of which acid?
A) Acetic acid B) Citric acid C) Tartaric acid D) Oxalic acid
99. Brine is an
A) Aqueous Solution of Sodium Hydroxide B) Aqueous Solution of Sodium Carbonate
C) Aqueous Solution of Sodium Chloride D) Aqueous Solution of Sodium Bicarbonate
100. Alkalis are
A) Acids, which are soluble in water B) Acids, which are insoluble in water
FUTURE VISION STUDY CENTRE - SALEM
CONTACT : 90420 30163
Answer key : Chemistry
Elements and Compounds, Acids, Basess Salts,
Petroleum Products, Fertilizers, Pesticides
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
