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Chemistry Miscellaneous Part-1

📆 October 24, 2024

Total Questions: 42

31. One carbon credit is equivalent to: [Uttarakhand P.C.S.S. (Pre) 2012]

Correct Answer: (c) 1000 kg of CO₂
Solution:The idea for carbon credits came from the Kyoto Protocol of 1997. A carbon credit is a tradable permit or certificate that provides the holder of the credit the right to emit one metric ton (1,000 kg or 2,204 pounds) of carbon dioxide or an equivalent mass of another greenhouse gas. Carbon credits and carbon markets are a component of national and international attempts to mitigate the growth in concentration of greenhouse gases.

32. With which of the following is BRIT (Government of India) engaged? [I.A.S. (Pre) 2008]

Correct Answer: (c) Isotope Technology
Solution:BRIT - Board of Radiation and Isotope Technology is an independent unit of the Department of Atomic Energy, which provides services based on radiation and isotopes for application in healthcare, agriculture, research, and industry.

33. Which one among the following is called Philosopher's wool? [U.P.P.C.S. (Pre) 2007]

Correct Answer: (c) Zinc Oxide
Solution:The compound Zinc Oxide (ZnO) is called Philosopher’s wool. Alchemists, as part of their rituals, would burn zinc in air and collect the residue, which formed into white woolly tufts. They called it lana philosophica in Latin, meaning philosopher's wool. Zinc oxide has many uses such as white pigment in paints, a component in zinc ointment for treating skin diseases, material in sunscreens and sun lotions, in rubber manufacture, and in photocopying products.

34. A pungent smell often present near the urinals is due to: [I.A.S. (Pre) 2007]

Correct Answer: (c) Ammonia
Solution:Urea, a component of urine, decomposes over time due to bacterial action. This decomposition produces ammonia (), which is characterized by its strong, pungent, and unpleasant odor. Urine is an aqueous solution of about 91-96% water. Other constituents include approximately: Urea 2.6%, Sodium 0.4%, Ammonia 0.05%, Phosphate 0.6%, Creatinine, and other dissolved ions.

35. A team of scientists at Brookhaven National Laboratory, including those from India, created the heaviest anti-matter (anti-helium nucleus). What is/are the implications of the creation of anti-matter? [I.A.S. (Pre) 2012]

  1. It will make mineral prospecting and oil exploration easier and cheaper.
  2. It will help probe the possibility of the existence of stars and galaxies made of anti-matter.
  3. It will help to understand the evolution of the universe.

Select the correct answer using the codes given below:

Correct Answer: (b) 2 and 3
Solution:The scientists discovered the heaviest antimatter ever observed in 2011 at Brookhaven National Laboratory on Long Island, N.Y. It is antihelium-4, a conglomeration of two antiprotons and two antineutrons. This discovery could help probe the possibility of the existence of stars and galaxies made of antimatter and aid in understanding the evolution of the universe.

36. In the context of which of the following do some scientists suggest the use of cirrus cloud thinning technique and the injection of sulphate aerosol into the stratosphere? [I.A.S. (Pre) 2019]

Correct Answer: (d) Reducing global warming
Solution:For reducing global warming, geo-engineering solutions have been suggested by scientists. The injection of sulphate aerosols into the stratosphere is one widely discussed idea as it reflects sunlight and can offset temperature rise. Cirrus cloud thinning is another technique that reduces infrared radiation trapped by the Earth, allowing heat to escape into space and cooling the planet.

37. Which one of the following chemicals had been in use till now for making artificial clouds? [U.P.P.C.S. (Spl.) (Mains) 2008]

Correct Answer: (d) Silver Iodide
Solution:Cloud seeding involves spreading silver iodide or dry ice into clouds to stimulate precipitation. Silver iodide is sprayed on clouds to encourage rain formation.

38. The substance used for artificial rain is: [U.P.P.C.S. (Mains) 2008]

Correct Answer: (c) Silver iodide
Solution:Cloud seeding involves spreading silver iodide or dry ice into clouds to stimulate precipitation. Silver iodide is sprayed on clouds to encourage rain formation.

39. Which of the following chemical is used in the artificial rain? [U.P.P.C.S. (Mains) 2013]

Correct Answer: (a) Silver Iodide
Solution:Cloud seeding involves spreading silver iodide or dry ice into clouds to stimulate precipitation. Silver iodide is sprayed on clouds to encourage rain formation.

40. Amount of rain depends on: [U.P.P.C.S. (Pre) 2017]

Correct Answer: (b) Humidity in atmosphere
Solution:The amount of rain depends on the humidity in the atmosphere. The amount of rainfall, whether drizzling, rainfall, or snowfall, increases the amount of moisture in the atmosphere.
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