General Science - Chemistry MCQs
61. Which among the following can be used as a preservative in Tomato Juice?
[A] Sodium Chloride
[B] Sodium carbonate
[C] Sodium benzoate
[D] Sodium Lauril Sulphate
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Correct Answer: C [Sodium benzoate]
62. Which among the following gas has lowest auto-ignition temperature?
[A] Methane
[B] Hydrogen
[C] Ethylene
[D] Carbon Di Sulphide
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Correct Answer: D [Carbon Di Sulphide]
Notes:
The auto-ignition temperature of a liquid, gas or vapor is the temperature at which the substance will ignite without any external heat source. Here is the temperature of some gases:
Methane -580 °C
Hydrogen -560 °C
Propane -493 °C
Ethylene -425 °C
Acetylene -305 °C
Naphtha -290 °C
Carbon disulfide -102 °C
63. Which among the following is the most stable form of carbon under standard conditions?
[A] Charcoal
[B] Graphite
[C] Diamond
[D] Amorphous carbon
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Correct Answer: B [Graphite]
64. Which among the following statement is correct?
[A] Both Melting point & Boiling Point of Heavy water are higher than normal water
[B] Both Melting point & Boiling Point of Heavy water are lower than normal water
[C] Melting point is higher and Boiling Point is lower than normal water
[D] Melting point is lower and Boiling Point is higher than normal water
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Correct Answer: A [Both Melting point & Boiling Point of Heavy water are higher than normal water]
65. Which among the following gives hissing sound when dissolved into H2O?
[A] CaCO2
[B] Ca(OH)2
[C] CaO
[D] CaCl2
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66. What is the number of naturally occurring Halogens in the periodic table?
[A] 3
[B] 4
[C] 5
[D] 6
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Correct Answer: C [5]
Notes:
fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At)
67. Which among the following is the lowest atomic number element without any stable isotopes?
[A] Technetium
[B] Molybdenum
[C] Ruthenium
[D] Niobium
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Correct Answer: A [Technetium]
68. Which among the following is the main constituent of malleable metal alloy Pewter ?
[A] Copper
[B] Zinc
[C] Tin
[D] Bismuth
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69. How many parts are of other metals in a 17 carat Gold?
[A] 3
[B] 5
[C] 7
[D] 9
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70. Which among the following does not come under carbon Group of Periodic Table?
[A] silicon
[B] germanium
[C] tin
[D] selenium
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Correct Answer: D [selenium]
Notes:
selenium is a chalcogen
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