Miscellaneous And Useful Chemical Compounds (Part-III)

  1. (d) Radiometer

 

Total Questions: 50

41. What is obtained on adding quick lime to H₂O? [S.S.C. Online MTS (T-I) 3.10.2017 (Shift-II)]

Correct Answer: (c) Slaked lime
Solution:Calcium oxide (CaO), also called quick lime, reacts with water (H₂O) to convert to calcium hydroxide [Ca(OH)₂]. Calcium hydroxide is also called slaked lime.

42. Slaked lime is chemically known as: [S.S.C. JE Mechanical Exam 27.10.2020 (Shift-I)]

Correct Answer: (a) Calcium hydroxide
Solution:Calcium oxide (CaO), also called quick lime, reacts with water (H₂O) to convert to calcium hydroxide [Ca(OH)₂]. Calcium hydroxide is also called slaked lime.

43. What is the chemical name of chalk? [S.S.C. Online Constable GD 22.02.2019 (Shift-I)]

Correct Answer: (b) Calcium carbonate
Solution:Chalk is a chemical compound made up of calcium, carbon, and oxygen. The chemical name of chalk is calcium carbonate (CaCO₃).

44. Limestone, chalk, and marble are different forms of: [S.S.C. Online CGL (T-I) 02.12.2022 (Shift-II)]

Correct Answer: (d) Calcium carbonate
Solution:Limestone, chalk, and marble are different forms of calcium carbonate (CaCO₃).
  • Calcium phosphate is a basic salt, as it is a salt of a weak acid (phosphoric acid) and a slightly stronger base (calcium hydroxide).
  • Limewater, also called milk of lime, is the common name for a saturated solution of calcium hydroxide.
  • Quicklime is also called lime (calcium oxide, CaO).

45. What is the chemical name of the deadly poison 'cyanide'? [S.S.C. Online Graduate Level (T-I) 12.06.2019 (Shift-II)]

Correct Answer: (d) Prussic Acid
Solution:The chemical name for the deadly poison 'cyanide' is prussic acid or hydrogen cyanide. Its chemical formula is HCN.

46. Limestone is a sedimentary rock, mainly composed of: [S.S.C. Online Graduate Level (T-I) 19.06.2019 (Shift-III)]

Correct Answer: (c) Calcium carbonate
Solution:Limestone is a sedimentary rock composed principally of calcium carbonate (Calcite) or the double carbonate of calcium and magnesium (dolomite).

47. Silica gel is a— [S.S.C. Online Graduate Level (T-I) 30.08.2016 (Shift-II)]

Correct Answer: (c) drying agent
Solution:Silica gel is a kind of drying agent. It is silicon dioxide (SiO₂), which is in the form of sand with fine pores. Moisture is absorbed by its tiny pore-forming particles.

48. Which of the following functional group of carbon does not contain oxygen? [S.S.C. Online MTS (T-I) 20.08.2019 (Shift-I)]

Correct Answer: (b) Halogen
Solution:The functional group of carbon such as alcohol (ROH), aldehyde (RCHO), ketone (RCOR), etc., contains oxygen, while the halogen group (CR-F, R-Cl, R-Br, and R-I) lacks oxygen.

49. How many Carbon and Hydrogen atoms are there in Propane, respectively? [S.S.C. Online Graduate Level (T-I) 7.03.2020 (Shift-III) Ans. (a)]

Correct Answer: (a) 3, 8
Solution:Propane is a hydrocarbon with the chemical formula C₃H₈. In this, 3 atoms of carbon and 8 atoms of hydrogen are linked to each other by a single bond.

50. Alkenes were earlier known as: [S.S.C. Online CHSL (T-I) 24.01.2017 (Shift-III)]

Correct Answer: (c) Olefins
Solution:Alkenes were formerly known as olefins. In organic chemistry, an alkene or olefin is an unsaturated chemical compound containing at least one carbon-to-carbon double bond and no other functional group, forming a homogeneous hydrocarbon chain.