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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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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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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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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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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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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68. Which among the following is the main constituent of malleable metal alloy Pewter ?

[A] Copper
[B] Zinc
[C] Tin
[D] Bismuth