Basic Chemistry Questions & Answers

11. Which among the following scientists had discovered Radium?
[A]Marie Skłodowska-Curie and Pierre Curie
[B]André-Louis Debierne
[C]Kasimir Fajans
[D]Oswald Helmuth Göhring

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12. Which among the following would cause the bright red colur due to bursting of crackers?
[A]Strontium
[B]Sodium
[C]Sulphur
[D]Magnesium

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13. Which among the following elemtns are generally find in free state?
[A]Group 11 elements
[B]Group 12 elements
[C]Group 13 elements
[D]Group 14 elements

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14. Which among the following is an example of a Chemical Change?
[A]Rusting of iron
[B]Magnetisation of iron
[C]Melting of iron
[D]Heating of iron

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15. The most important contributor of sea salt is ____?
[A]Rivers
[B]Salty Rocks at bottom of sea
[C]Aquatic animals in Sea
[D]Atmosphere around sea

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16. Which among the following is the most abundant organic compound in nature?
[A]Glucose
[B]Fructose
[C]Sucrose
[D]Cellulose

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17. Which among the following is the objective of the Methyl tert-butyl ether (MTBE) mixing with Petroleum?
[A]Raise Octane Number
[B]Antioxidant Stabilizer
[C]Lead Scavanger
[D]Fuel Dye

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18. When a tubelight breaks, a cracking sound is produced because ____?
[A]Pressure inside the lamp is less than atmospheric pressure
[B]Pressure inside the lamp is more than atmospheric pressure
[C]The lamp is filled with reactive gases
[D]The lamp is filled with mercury vapour

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19. In the manufacture of Vanaspati ghee from vegetable oils, which among the following gas is used?
[A]N2
[B]CO2
[C]H2
[D]Ne

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20. In which among the following categories, Radon (Rn) can be placed?
1. Radioactive Element
2. Inert Gas
3. Noble Gas
Choose the correct option:
[A]Only 1
[B]1 & 2
[C]2 & 3
[D]1, 2 & 3

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