General Science Chemistry MCQs
Chemistry Objective (Multiple Choice) General Knowledge Questions & Answers for SSC-CGL, UPPSC, UPSC, NDA, CDS and UPSC Civil Services Prelims Examination
71. Which of the following chemical is produced when Ethene reacts with cold aqueous solution of Bayer’s reagent?
[A] Methanol
[B] Glycol
[C] Methanal
[D] Ethyne
Show Answer
Correct Answer: B [Glycol]
Notes:
Alkenes on reaction with cold, dilute, aqueous solution of potassium permanganate (Baeyer’s reagent) produce vicinal glycols.
72. Which of the following is a property of Alkanes?
[A] Alkanes are unreactive at normal conditions
[B] Alkanes are also known as Paraffins
[C] Both a and b
[D] None
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Correct Answer: C [Both a and b]
Notes:
Alkanes are inert under normal conditions as they do not react with acids, bases and other reagents. They are also known as paraffins.
73. Which of the following polymer is obtained by the condensation reaction between ethylene glycol and terephthalic acid?
[A] Terelene
[B] PMMC
[C] PVC
[D] None of the above
Show Answer
Correct Answer: A [Terelene]
Notes:
Terelene is a polymer obtained by the condensation reaction between ethylene glycol and terephthalic acid. It is widely used in making wash and wear fabrics as it has low absorbing power.
74. Which of the following is a polymer of amino acids?
[A] Starch
[B] Cellulose
[C] Proteins
[D] None of the above
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Correct Answer: C [Proteins]
Notes:
Proteins are the polymers of amino acids. They have generally 20 to 1000 amino acids joined together in a highly organized arrangement.
75. Which of these is a man-made polymer?
[A] Nylon
[B] Teflon
[C] Bakelite
[D] All of the above
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Correct Answer: D [All of the above]
Notes:
The polymers which are prepared in the laboratories are known as synthetic polymers. These are also called man-made polymers. Polyethene, PVC, nylon, Teflon, bakelite, terylene, synthetic rubber, etc. are some of the examples.
76. Which of the following metal is the key component of Vitamin B12?
[A] Iron
[B] Zinc
[C] Copper
[D] Cobalt
Show Answer
Correct Answer: D [Cobalt]
Notes:
Cobalt is the key component of Vitamin B12. Cobalt is a metal with atomic number 27. The cobalt metal produced by reductive smelting is hard, lustrous and silver-gray in colour.
77. Which of the following metals are the constituents of German silver?
[A] Nickel
[B] Copper
[C] Zinc
[D] All of the above
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Correct Answer: D [All of the above]
Notes:
German Silver is an alloy of copper, zinc and nickel. The usual formulation is 60% copper, 20% nickel and 20% zinc. It is named german silver due to its silvery appearance, but it does not contain silver.
78. Which of the following metals is the major constituent of Pewter alloy?
[A] Tin
[B] Indium
[C] Titanium
[D] Lead
Show Answer
Correct Answer: A [Tin]
Notes:
Tin is the major constituent of Pewter alloy. It is traditionally composed of 85–99% tin, mixed with copper, antimony, bismuth.
79. Which metal has the highest melting point among all metals?
[A] Tungsten
[B] Ruthenium
[C] Gold
[D] Bismuth
Show Answer
Correct Answer: A [Tungsten]
Notes:
Of all the metals, Tungsten has the highest melting point (3422 °C). Also, it has the lowest vapor pressure and the highest tensile strength among all the metals.
80. Which of these non-metals is lustrous?
[A] iodine
[B] selenium
[C] phosphorous
[D] All of the above
Show Answer
Correct Answer: A [ iodine ]
Notes:
Iodine is the only non-metal which is lustrous in nature. All the other non-metals are non-lustrous in nature. This property of iodine makes it unique among the non-metals.
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