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Chemistry (Part-VI)

📆 October 29, 2024

Total Questions: 49

41. Potassium Permanganate is used for purifying drinking water because- [S.S.C. Online Graduate Level (T-I) 2.09.2016]

Correct Answer: (b) It is an oxidising agent
Solution:It is an oxidising agent - Potassium permanganate () is a strong oxidizing agent. It purifies drinking water by oxidizing organic matter and harmful microorganisms present in the water, effectively disinfecting it.

42. When the process of format an ion of hydrogen by passing steam over red hot iron is presented in the form of a balanced chemical equation, then the number of water molecules on the left-hand side of the equation is _______. [S.S.C. Online M.T.S. (T-I) 13.10.2021]

Correct Answer: (a) Four
Solution:When water vapour is passed over the hot iron, iron oxide is formed and hydrogen gas is liberated, whose chemical equation is as follows—

3Fe + 4H₂O → Fe₃O₄ + 4H₂

So it is clear that the number of water molecules in the left side is 4.

43. Chemical disinfection of drinking water can be done using: [S.S.C. JE Mechanical Exam 22.03.2021]

Correct Answer: (c) Chlorine
Solution: Chlorine - Chlorine is widely used for the chemical disinfection of drinking water. It is effective in killing many types of bacteria, viruses, and protozoa. Fluorine is used for preventing tooth decay, bromine is less commonly used than chlorine, and iodine can be used but is also less common for large-scale water treatment.

44. ________ is the movement of chemicals in the upper layers of soil into lower layers or into groundwater by being dissolved in water. [S.S.C. Online CHSL (T-I) 3.02.2017]

Correct Answer: (d) Leaching
Solution:Leaching - Leaching is the process where water-soluble constituents (like chemicals, minerals, or contaminants) are transported from the upper layers of the soil down to lower layers or into groundwater as water percolates through the soil.

45. Solid carbon dioxide is known as ______ . [S.S.C. Online CHSL (T-I) 19.01.2017]

Correct Answer: (d) Dry Ice
Solution:Dry Ice - Solid carbon dioxide () is commonly known as dry ice because it sublimes (turns directly from a solid to a gas) at atmospheric pressure without melting into a liquid, appearing "dry."

46. What is the more common name for solid carbon dioxide? [S.S.C. Online Graduate Level (T-I) 3.03.2020]

Correct Answer: (c) Dry Ice
Solution:Dry Ice - Solid carbon dioxide () is commonly known as dry ice because it sublimes (turns directly from a solid to a gas) at atmospheric pressure without melting into a liquid, appearing "dry."

47. Which gas in its solid state is also known as dry ice? [S.S.C. Online Graduate Level (T-I) 4.06.2019]

Correct Answer: (a) Carbon dioxide
Solution:Dry Ice - Solid carbon dioxide () is commonly known as dry ice because it sublimes (turns directly from a solid to a gas) at atmospheric pressure without melting into a liquid, appearing "dry."

48. When dry ice is heated, it changes directly into: [S.S.C. JE. Mechanical Exam 27.10.2020]

Correct Answer: (c) Gas
Solution: Gas - When dry ice (solid carbon dioxide) is heated at atmospheric pressure, it undergoes sublimation and directly changes into gaseous carbon dioxide.

49. What is formed when carbon dioxide is passed through lime water? [S.S.C. Online Graduate Level (T-I) 22.08.2017]

Correct Answer: (b) Calcium carbonate
Solution:Calcium carbonate - When carbon dioxide () gas is passed through lime water (which is a solution of calcium hydroxide, ), it reacts to form calcium carbonate (), which is a white precipitate, making the lime water turn milky.
The reaction is:
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