Miscellaneous And Useful Chemical Compounds (Part-I)

Total Questions: 50

21. Particulates (< 1 µm size) remaining suspended in air indefinitely and transported by wind currents are called— [S.S.C. Online Graduate Level (T-I) 10.09.2016 (Shift-II)]

(a) Mists
(b) Fumes
(c) Aerosols
(d) Smoke

Correct Answer: (c) Aerosols

Solution:An aerosol is a colloid of solid particles or liquid droplets in air or gas. Examples of natural aerosols are fog, deforestation, etc., while artificial aerosols include mist, dust particles, particulate matter, etc. The size of aerosol particles is mostly less than 1 µm.

22. Which one of the following is commonly used for pulp bleaching in the paper industry? [S.S.C. Online Graduate Level (T-I) 9.09.2016 (Shift-III)]

(a) Mild Sulphuric Acid
(b) Glucose Isomerase
(c) Hydrogen Peroxide
(d) Iodine and Water

Correct Answer: (c) Hydrogen Peroxide

Solution:Hydrogen peroxide (H₂O₂) is a completely chlorine-free bleaching agent. Its use in the paper industry has increased because it can be used easily and the cost is also low. Hydrogen peroxide is also used to soft bleach objects like silk, wool, feathers, hair, straws, ivory, etc.

23. The three-carbon molecules broken down from six-carbon molecules of glucose during the first step in the process of nutrition in all organisms is called: [S.S.C. Online CHSL (T-I) 12.10.2020 (Shift-III)]

(a) Pyruvate
(b) Ethane
(c) Methane
(d) Butane

Correct Answer: (a) Pyruvate

Solution:During the first step in the process of nutrition in all organisms, three of the six carbon atoms of glucose are released to form an important chemical compound called pyruvate. Its chemical formula is C₃H₄O₃. These molecules serve to provide energy.

24. What is the function of a catalyst in a chemical reaction? [S.S.C. Online CHSL (T-I) 10.01.2017 (Shift-III)]

(a) changes the potential energy of the factors.
(b) changes the kinetic energy of the factors.
(c) changes the potential energy of the products.
(d) changes activation energy.

Correct Answer: (d) changes activation energy.

Solution:When the rate of a chemical reaction increases with the amount of a substance present, it is called catalysis. The presence of a substance that increases the rate of reaction is called a catalyst. The catalyst does not participate in any reaction, only the action affects the activation energy. Catalysts play a major role in the manufacture of industrially important chemicals, as their use increases the rate of reaction.

25. Which chemical compound, with the chemical formula CH₃CH₂Cl, is used [S.S.C. Online CHSL (T-I) 08.06.2022 (Shift-I)]

(a) 3-Chlorohexane
(b) 1-chloropropane
(c) Chloromethane
(d) Chloroethane

Correct Answer: (d) Chloroethane

Solution:Chloroethane with the chemical formula CH₃CH₂Cl is used as a blowing agent in foamed plastics. It was a promoter chemical in the aluminum chloride-catalyzed process to produce ethylbenzene. Now, it is not widely used in any of these roles.

The chemical formula of 3-Chlorohexane is C₆H₁₃Cl.
n-Propyl chloride (also 1-propyl chloride or 1-chloropropane) is a colorless, flammable chemical compound. It has the chemical formula C₃H₇Cl.
Chloromethane, also called methyl chloride, Refrigerant-40, R-40 or HCC 40, is an organic compound with the chemical formula CH₃Cl.

26. The model of action proposed by J.J. Thomson is commonly called the _____ model. [C.P.O. S.I. 5.06.2016 (Shift-I)]

(a) Cream and Cake
(b) Plum and Pudding
(c) Plum and Cake
(d) Cream and Pudding

Correct Answer: (b) Plum and Pudding

Solution:The model of action proposed by J.J. Thomson is also commonly called the Plum and Pudding model. He proposed it in the year 1904.

27. Who proposed the 'plum pudding' theory of the divisible atom in which negatively charged electrons were scattered in a lump of positive charge like a raisin in plum pudding? [S.S.C. Online CHSL (T-I) 08.06.2022 (Shift-II)]

(a) Robert Andrews Millikan
(b) Ernest Rutherford
(c) Sir JJ Thomson
(d) Henri Becquerel

Correct Answer: (c) Sir JJ Thomson

Solution:Sir JJ Thomson proposed the 'plum pudding' theory of the divisible atom in which negatively charged electrons were scattered in a lump of positive charge like a raisin in plum pudding. The plum pudding model is one of several historical, scientific atom models. The plum pudding model has electrons surrounded by a volume of positive charge, like negatively charged "plums" embedded in a positively charged "pudding."

28. Zeolite is— [S.S.C. Online Graduate Level (T-I) 27.08.2016 (Shift-I)]

(a) hydrated ferric oxide
(b) hydrated sodium aluminium silicate
(c) sodium hexameta phosphate
(d) sodium tetraborate

Correct Answer: (b) hydrated sodium aluminium silicate

Solution:Zeolite is a porous aluminosilicate mineral that forms naturally in rocks formed from volcanic lava. A large amount of various metallic ions Na⁺, K⁺, Ca²⁺, and Mg²⁺ and others are combined from zeolite. Industrially prepared by the interaction of zeolite-sodium aluminate and sodium silicate reagents.

29. The largest source of pollution in the world is— [S.S.C. Online Graduate Level (T-I) 27.08.2016 (Shift-I)]

(a) Herbicides and insecticides
(b) Automobile exhausts
(c) Sewage and garbage
(d) Industrial effluents

Correct Answer: (c) Sewage and garbage

Solution:Pollution is an undesirable change in the physical, chemical, and biological characteristics of air, land, and water, which affect the life of human beings or other organisms. The biggest source of pollution in the world is Sewage and Garbage, which pollutes water, air, and soil.

30. Which of the following gases if present in the atmosphere can be detected by its odour? [S.S.C. Online CHSL (T-I) 10.01.2017 (Shift-III)]

(a) Ethane
(b) Sulfur dioxide
(c) Hydrogen
(d) Carbon monoxide

Correct Answer: (b) Sulfur dioxide

Solution:Sulfur dioxide is a chemical compound. Its chemical formula is SO₂. It is recognized in the environment due to its strong smell. It is a strong toxic gas, which is released in many industrial processes and by volcanoes.

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