Chemistry (Part-XI)

Total Questions: 50

31. Which of the following is NOT a property of graphite? [S.S.C. Online MTS (T-I) 12.10.2021 (Shift-I) ]

Correct Answer: (b) It has low melting point.
Solution:Graphite has a very high melting point, one of the highest among all known substances (around 3600-3700°C). This is due to its strong covalent bonds within each layer.

32. How many natural isotopes of carbon are there? [S.S.C. Online MTS (T-I) 11.10.2021 (Shift-III) ]

Correct Answer: (a) 3
Solution:Carbon is found in nature in the form of three isotopes, namely carbon-12, carbon-13, and carbon-14, all of them have 6 protons in their nucleus, but the number of neutrons is different in each i.e. 6, 7, and 8 respectively.

33. Which of the following is a tough, porous and black substance, and almost a pure form of carbon? [S.S.C. Online MTS (T-I) 11.07.2022 (Shift-I) ]

Correct Answer: (d) Coke
Solution:The tough, porous, and black substance, and almost a pure form of carbon is coke. It is obtained from heating coal in the absence of air, and it is widely used as a fuel and as a reducing agent in industries. Coke is used in the production of iron and steel in blast furnaces, and it is also used as a fuel in power plants and cement kilns. The other options listed are also hydrocarbons derived from coal, but they have different properties and uses.

34. Which of the following is not a good conductor of electricity? [S.S.C. Online C.H.S.L. (T-I) 19.04.2021 (Shift-II) ]

Correct Answer: (d) Diamond
Solution:Diamond is not a good conductor of electricity, because the carbon atoms in diamond are linked together by covalent bonds. Hence free electrons are not available in diamonds for the conduction of electricity.

35. Which of the following is amongst the few carbon-containing compounds NOT classified as organic? [S.S.C. Online Graduate Level (T-I) 7.06.2019 (Shift-I) ]

Correct Answer: (c) Cyanides
Solution:Organic chemistry is generally defined as the chemistry of carbon compounds, but there are exceptions. These exceptions typically include simple carbon compounds that are often inorganic in nature.

Inorganic Carbon Compounds (exceptions to organic):

      • Carbon oxides (CO, CO₂)
      • Carbonates (e.g., CaCO₃)
      • Bicarbonates (e.g., NaHCO₃)
      • Carbides (e.g., CaC₂)
      • Cyanides (e.g., KCN, HCN)
      • Allotropes of carbon (diamond, graphite, fullerenes)

36. Buckminsterfullerene is an allotrope of: [S.S.C. Online Graduate Level (T-I) 4.06.2019 (Shift-II) ]

Correct Answer: (c) Carbon
Solution:Buckminsterfullerene (C₆₀), often simply called a fullerene, is a spherical molecule made entirely of carbon atoms. It's one of the well-known allotropes of carbon, along with diamond and graphite. Its structure resembles a soccer ball.

37. The property of catenation is predominant in _____ . [S.S.C. Online Graduate Level (T-I) 4.06.2019 (Shift-I) ]

Correct Answer: (a) Carbon
Solution:The property of catenation is strong in carbon. Therefore, compounds of carbon are also found in the largest number in nature. carbon is a tetravalent element and it forms long chains by joining its own atoms by a double bond (=), triple bond (≡), and single bond (–).

38. Which one of the following is not a metalloid? [S.S.C. Online MTS (T-I) 20.08.2019 (Shift-I) ]

Correct Answer: (c) Carbon
Solution:Boron, arsenic, and silicon are metalloid elements. These elements exhibit some metallic properties, but in some cases also possess non-metallic properties. Carbon (C) exhibits completely non-metallic properties, so it is not a metalloid.

39. Which of the following is not an allotrope of carbon? [S.S.C. Online MTS (T-I) 14.08.2019 (Shift-I) ]

Correct Answer: (b) Methane
Solution:Graphite, diamond, and C₆₀ Buckminsterfullerene are all allotropes of carbon (C), while methane (CH₄) is a compound made of carbon and hydrogen.

40. Diamond is an allotrope of : [S.S.C. JE Mechanical Exam 27.10.2020 (Shift-I) ]

Correct Answer: (d) Carbon
Solution:Diamond is an allotrope of carbon. When an element is found in many forms, this property of the element is called allotropy. Other allotropes of carbon are graphite, coal, coke, charcoal, fullerene, etc. Diamond and graphite are the two major crystalline forms of carbon.