General Science - Chemistry MCQs
11. Which among the following minerals is also known as Horn Silver?
[A] Silver Iodide
[B] Silver Chroride
[C] Zinc Phosphate
[D] Silver Sulphide
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Correct Answer: B [Silver Chroride]
12. Consider the following particles in relation to the matter:
- π-Meson (Pi-meson)
- Photon
Which among the above are considered to be mass less and charge less?
[A] Only 1
[B] Only 2
[C] Both 1 & 2
[D] Neither 1 nor 2
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Correct Answer: B [Only 2]
13. Polymetallic Modules (PMN) predominantly contain_____?
[A] Calcium
[B] Magnesium
[C] Manganese
[D] Copper
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Correct Answer: C [Manganese]
14. The colors in the fine cut diamond are because of which among the following?
[A] Variance in transparency of diamond
[B] Variance in index of refraction
[C] Presence of Impurities
[D] Existence of definite planer layers
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Correct Answer: C [Presence of Impurities]
Notes:
Pure diamond should transmit visible light and appear as a clear colorless crystal. Colors in diamond originate from lattice defects and impurities. The diamond crystal lattice is exceptionally strong and only atoms of nitrogen, boron and hydrogen can be introduced into diamond during the growth at significant concentrations (up to atomic percents). Nitrogen gives yellowish color while the Boron gives bluish color.
15. Benzoepin, Parrysulfan, Phaser, Thiodan, Thionex etc. are the names of which among the following pesticides?
[A] Kepone
[B] Paraquat
[C] Endosulfan
[D] Toxaphene
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Correct Answer: C [Endosulfan]
16. An aqueous solution of Sodium Acetate will be of which among the following nature?
[A] Acidic
[B] Basic
[C] Neutral
[D] Either acidic or basic depending upon temperature of solution
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Correct Answer: B [Basic]
17. Aluminum is getting popular worldwide today as a “Green Metal”. Which among the following properties of Aluminum makes it a Green Metal?
[A] Aluminum has been providing a replacement of wood for saving forests and contributes in environment protection
[B] Aluminum is a light metal and it is resistant to corrosion
[C] Aluminum has fairly high rate of recycling and it can be re-used repeatedly without its quality deteriorating
[D] The lands after the Bauxite mining can be restored very quickly and easily
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Correct Answer: C [Aluminum has fairly high rate of recycling and it can be re-used repeatedly without its quality deteriorating]
18. Acetylene cannot be safely pressurized as a pure compound. Which among the following is used for safe storage and transportation of Acetylene?
[A] Kerosene
[B] Acetone
[C] Vinegar (Acetic Acid)
[D] Propylene glycol
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Correct Answer: B [Acetone]
19. Above 70 °C, sodium bicarbonate has a property of gradually decomposing, which makes it usable in Bakery products. Which among the following end product of this Thermal decomposition of Sodium bicarbonate makes it usable for the above purpose?
[A] Hydrogen
[B] Carbon Dioxide
[C] Water Vapor
[D] Sodium Carbonate
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Correct Answer: B [Carbon Dioxide]
Notes:
Above 70 °C, sodium bicarbonate gradually decomposes into sodium carbonate, water and carbon dioxide as follows –
2 NaHCO3 → Na2CO3 + H2O + CO2 ,
In bakery, it reacts with other components or decomposes at higher temperature to release carbon dioxide, which causes dough to rise.
20. Which among the following substances is being used most commonly for producing synthetic jet Fuel?
[A] Coal
[B] Natural Gas
[C] Plastic Waste
[D] Biomass
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