Miscellaneous And Useful Chemical Compounds (Part-III)

  1. (d) Radiometer

 

Total Questions: 50

31. Which of the following produces the most solid waste? [S.S.C. Online Graduate Level (T-I) 2.09.2016 (Shift-III)]

Correct Answer: (c) Manufacturing
Solution:Resources from industrial processes, living standards, and raw materials that are wasteful or decaying, agreeing with the flourishing capital, also come under the category of pollution. Most of the solid waste production among the above options is generated by the industry.

32. Which among the following is false about alpha particles? [S.S.C. Online CHSL (T-I) 10.01.2017 (Shift-II)]

Correct Answer: (b) They have high penetrating power
Solution:Alpha (α), beta (β), and gamma (γ) are radioactive radiation. In these, the alpha particle is the positively charged helium center, whose penetrating power is much less than that of beta (β) and gamma (γ) rays.

33. For what is the Radiocarbon dating technique used? [S.S.C. Online CHSL (T-I) 15.01.2017 (Shift-I)]

Correct Answer: (c) To estimate the age of fossils
Solution:Radiocarbon dating is used to find the age of fossils (dead parts) of organisms and plants that once lived on Earth. Carbon has an isotope C-14, which is temporary. In addition to the normal carbon atoms in every living organism, there is also a certain amount of C-14, which after they die, gradually decays to C-12. The age of the fossil can be found by calculating the half-life (for C-14) of the number of C-14 decayed in a fossil.

34. Carbon dating means: [S.S.C. Online CPO SI (T-I) 09.11.2022 (Shift-I)]

Correct Answer: (c) a method of calculating the age of very old objects by measuring the amounts of different forms of carbon in them
Solution:A method of calculating the age of very old objects by measuring the amounts of different forms of carbon in them. Carbon dating, also known as radiocarbon dating, is a technique used to determine the age of organic materials up to 50,000 years old. It works by measuring the amount of radioactive carbon-14 in the sample and comparing it to the amount of stable carbon-12. The ratio between the two can be used to estimate the age of the material.

35. The chemical that is used to ripen mangoes is— [S.S.C. Online Graduate Level (T-I) 4.09.2016 (Shift-III)]

Correct Answer: (b) Calcium Carbide
Solution:Calcium carbide is used for ripening mangoes. Its chemical formula is CaC₂. When calcium carbide comes in contact with water or water vapor, acetylene gas (C₂H₂) is produced, which accelerates the ripening of fruits.

36. Which chemical is used for the artificial ripening of mangoes? [S.S.C. Online CHSL (T-I) 19.01.2017 (Shift-II)]

Correct Answer: (c) Calcium carbide
Solution:Calcium carbide is used for ripening mangoes. Its chemical formula is CaC₂. When calcium carbide comes in contact with water or water vapor, acetylene gas (C₂H₂) is produced, which accelerates the ripening of fruits.

37. Which gas is used by chemical leaveners, such as baking powder and baking soda, to lighten and aerate baked goods? [S.S.C. Online CPO SI (T-I) 09.11.2022 (Shift-I)]

Correct Answer: (b) Carbon dioxide
Solution:Chemical leaveners, such as baking powder and baking soda, typically use carbon dioxide gas to lighten and aerate baked goods. When these leaveners are added to a recipe, they react with other ingredients, such as acid or moisture, to produce carbon dioxide gas. This gas forms bubbles in the batter or dough, which causes the mixture to expand and rise during baking, resulting in a lighter and fluffier texture.

38. What is the dominant chemical present in detergent powder? [S.S.C. Online Graduate Level (T-I) 12.06.2019 (Shift-I)]

Correct Answer: (b) Sodium Carbonate
Solution:Sodium carbonate (Na₂CO₃) is found in detergent powder. Sodium carbonate is also called washing soda. Sodium carbonate is also used prominently in the manufacture of glass.

39. What is the chemical name of quicklime? [S.S.C. Online C.P.O.S.I. (T-I) 7.07.2017 (Shift-I)]

Correct Answer: (b) Calcium oxide
Solution:The chemical name of quicklime is calcium oxide and its chemical formula is CaO. It is also known as 'Burnt Lime'. It is a flammable, alkaline, and crystalline solid substance of white color.

40. Chemical formula of quick lime is: [S.S.C. Online CGL (T-I) 01.12.2022 (Shift-I)]

Correct Answer: (a) CaO
Solution:A chemical with the formula CaO, commonly called quick lime or hot lime. When hydrated with one mole of water, it forms slaked lime, Ca(OH)₂. Quick lime is preferred to slake lime at oil mud mixing plants because it generates heat when it becomes slaked with water and therefore speeds up emulsification by the reaction to form calcium fatty-acid soap.