General Science - Chemistry MCQs
71. Which among the following is not correctly matched?
[A] Sodium: Natrium
[B] Pottassium : Kalium
[C] Mercury :Hydrargyrum
[D] Arsenic : Stibium
Show Answer
Correct Answer: D [Arsenic : Stibium]
Notes:
Stibium is Antimony
72. The chemical oxygen demand COD test is commonly used to measure which of the following?
[A] amount of organic compounds in water
[B] amount of oxygen in water
[C] amount of oxygen in a chemical
[D] amount of oxygen used in a oxygenation process
Show Answer
Correct Answer: A [amount of organic compounds in water]
Notes:
chemical oxygen demand is a measure of water quality and is amount of organic pollutants found in surface water. Potassium permanganate has been used for many years to measure COD
73. Which among the following is an organic mineral?
[A] Amber
[B] Hornblende
[C] Angite
[D] Analcime
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Correct Answer: A [Amber]
74. Liming is the application of calcium and magnesium rich materials to soil in various forms, including marl, chalk, limestone, or hydrated lime. What is the purpose of liming?
[A] Increase the Soil pH
[B] Increase the bacteria activity
[C] Both A & B
[D] Decrease the bacterial activity
Show Answer
Correct Answer: C [Both A & B]
75. Who among the following established that genetic code of all organisms is spelled out in three-letter words, each set of three nucleotides codes for a specific amino acid?
[A] Hargobind Khorana
[B] Barbara McClintock
[C] Theodor O. Diener
[D] Joseph L. Goldstein
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Correct Answer: A [Hargobind Khorana]
76. Which among the following is a main component of some alert tablets such as Alert, No Doz, Stay Awake & Vivarin?
[A] Thein
[B] Caffeine
[C] Nicotine
[D] catechins
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Correct Answer: B [Caffeine]
77. Which among the following compound of barium is used as radio contrast agent for X-ray imaging and other diagnostic procedures and also commonly called as Barium Food?
[A] Barium Carbonate
[B] Barium Sulphate
[C] Barium Bromide
[D] Barium hydroxide
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Correct Answer: B [Barium Sulphate]
78. Which among the following is used as an antidote?
[A] Paracetamol
[B] Nicotine
[C] Thiamine
[D] Activated Charcoal
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Correct Answer: D [Activated Charcoal]
79. Which among the following will undergo a chemical reaction depending on the pH of the solution?
[A] Calcium Oxide
[B] Zinc Oxide
[C] Ferric Oxide
[D] Ferrous Oxide
Show Answer
Correct Answer: B [Zinc Oxide]
80. Which among the following will undergo a chemical reaction depending on the pH of the solution?
[A] Calcium Oxide
[B] Zinc Oxide
[C] Ferric Oxide
[D] Ferrous Oxide
Show Answer
Correct Answer: B [Zinc Oxide]
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