Miscellaneous And Useful Chemical Compounds (Part-II)

41. Which of the following is amongst the few carbon-containing compounds NOT classified as organic? [S.S.C. Online Graduate Level (T-1) 7.06.2019 (Shift-I)]

(a) Nucleic Acids
(b) Propane
(c) Cyanides
(d) Methane

Correct Answer: (c) Cyanides

Solution:Some carbon-containing compounds are not classified as organic, including carbides, carbonates, and cyanides. In the given options, cyanides are considered as low-carbon compounds.

42. Buckminsterfullerene is an allotrope of: [S.S.C. Online Graduate Level (T-1) 4.06.2019 (Shift-II)]

(a) Iron
(b) Boron
(c) Carbon
(d) Phosphorus

Correct Answer: (c) Carbon

Solution:It is an allotrope of carbon with the formula C₆₀ in which the carbon atoms combine with each other to form a closed shape like a football.

43. The property of catenation is predominant in [S.S.C. Online Graduate Level (T-1) 4.06.2019 (Shift-I)]

(a) Carbon
(b) Sulphur
(c) Silicon
(d) Nitrogen

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 (-).

44. Which one of the following is not a metalloid? [S.S.C. Online MTS (T-1) 20.08.2019 (Shift-I)]

(a) Boron
(b) Arsenic
(c) Carbon
(d) Silicon

Correct Answer: (b) Arsenic

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.

45. Which of the following is not an allotrope of carbon? [S.S.C. Online MTS (T-1) 14.08.2019 (Shift-I)]

(a) Graphite
(b) Methane
(c) Diamond
(d) C-60 Buckminsterfullerene

Correct Answer: (b) Methane

Solution:Graphite, diamond, and C-60 Buckminsterfullerene are all allotropes of carbon (C), while methane (CH₄) is a compound made of carbon and hydrogen

46. Which one of the following is the scientific name of a mineral called [S.S.C. Online MTS (T-I) 11.10.2021 (Shift-I)]

(a) Aluminium chromium oxide
(b) Copper chromium oxide
(c) Silver chromium oxide
(d) Iron chromium oxide

Correct Answer: (d) Iron chromium oxide

Solution:Chromite is an oxide mineral (FeCr₂O₄) composed of chromium, iron, and oxygen, also known as iron chromium oxide.

47. Which of the following is a property of silicon dioxide? [S.S.C. Online MTS (T-I) 11.10.2021 (Shift-III)]

(a) It is a good conductor of electricity.
(b) It is soft.
(c) It has a high melting point.
(d) It is soluble in water.

Correct Answer: (c) It has a high melting point.

Solution:Silicon dioxide or silica (SiO₂) is the oxide of silicon. It is a poor conductor of electricity, it is also not soluble in water and has a high melting point.

48. Amino acids are often referred to as the building blocks of: [S.S.C. Online C.H.S.L. (T-I) 19.04.2021 (Shift-II)]

(a) Sugars
(b) Carbohydrates
(c) Fats
(d) Proteins

Correct Answer: (d) Proteins

Solution:Amino acids are the building blocks or basic structural units of proteins.

49. Chemicals called ________ link to form proteins. [S.S.C. Online C.H.S.L. (T-I) 10.08.2021 (Shift-I)]

(a) Citric acids
(b) Nitric acids
(c) Amino acids
(d) Oxalic acids

Correct Answer: (c) Amino acids

Solution:Amino acids are the building blocks of a protein molecule. Amino acids are small organic molecules consisting of an alpha (central) carbon atom attached to an amino group, a carboxyl group, and a variable component (or side chain).

50. Phenylmercuric acetate ________. [S.S.C. Online MTS (T-I) 15.10.2017 (Shift-II)]

(a) Reduces transpiration rate
(b) Increases transpiration rate
(c) Kills the plant
(d) Reduces respiration

Correct Answer: (a) Reduces transpiration rate

Solution:Phenyl mercuric acetate is an organic mercury compound with the chemical formula CH₃COOHgC₆H₅. Earlier this compound was used as a preservative in paints, etc. Spraying this compound on the leaves of plants reduces the rate of transpiration in them.