Chemistry (Part-XIII)

21. Methyl Propane is an isomer of: [S.S.C. Online Graduate Level (T-I) 4.06.2019 (Shift-I) ]

(a) n-Propane
(b) n-Hexane
(c) n-Pentane
(d) n-Butane

Correct Answer: (d) n-Butane

Solution:Isomers are compounds that have the same molecular formula but different structural formulas (arrangement of atoms).

Methyl propane is another name for isobutane. Its molecular formula is C₄H₁₀. It has a branched structure: CH₃ $- C H (CH₃) -CH₃$ .
n-Butane (normal butane) is a straight-chain alkane with the molecular formula C₄H₁₀. Its structure is CH₃ $- C H₂ - C H₂ -CH₃$ .
Since both methyl propane (isobutane) and n-butane have the same molecular formula
(C₄H₁₀) but different arrangements of atoms, they are isomers of each other.

22. Benzene is _____ in Ethyl Alcohol. [S.S.C. Online CHSL (T-I) 25.01.2017 (Shift-II) ]

(a) soluble
(b) solute
(c) insoluble
(d) insolate

Correct Answer: (c) insoluble

Solution:Benzene is insoluble in ethyl alcohol. Ethyl alcohol is a polar compound, whereas benzene is a completely non-polar organic compound. Hence it cannot dissolve in ethyl alcohol.

23. What is the main component of natural gas? [C.P.O. S.I. 5.06.2016 (Shift-I) ]

(a) Methane
(b) Helium
(c) Nitrogen
(d) Propane

Correct Answer: (a) Methane

Solution:Natural gas is primarily composed of methane ( $C H₄$ ), typically making up 70% to 90% or more of its volume. It also contains smaller amounts of other hydrocarbons like ethane, propane, and butane, as well as non-hydrocarbon gases like nitrogen, carbon dioxide, and helium.

24. Which one of the following is the primary component of natural gas? [S.S.C. Online MTS (T-I) 18.10.2021 (Shift-III) ]

(a) Carbon Dioxide
(b) Nitrogen
(c) Methane
(d) Helium

Correct Answer: (c) Methane

Solution:The main component of natural gas is methane (CH₄) It is an flammable organic gas. Due to being flammable, it is used as a fuel.

25. Which of the following is the largest component of natural gas? [S.S.C. Online MTS (T-I) 22.10.2021 (Shift-II) ]

(a) Methane
(b) Methanol
(c) Ethane
(d) Ethanol

Correct Answer: (a) Methane

Solution:The main component of natural gas is methane (CH₄) It is an flammable organic gas. Due to being flammable, it is used as a fuel.

26. Which of the following is used as an aesthetics? [S.S.C. Online Graduate Level (T-I) 1.09.2016 (Shift-III) ]

(a) N₂
(b) N₂O
(c) CH₄
(d) CO₂

Correct Answer: (b) N₂O

Solution:Nitrous oxide (N₂O) is also called laughing gas. Smelling it in excessive quantity leads to a state of unconsciousness. For this reason, this gas is also used as an anesthetic. Dentists use nitrous oxide gas for painless therapy.

27. Which of the following gases is known as "Laughing Gas"? [S.S.C. Online Graduate Level (T-I) 10.09.2016 (Shift-III) ]

(a) Nitrous Oxide
(b) Nitrogen Peroxide
(c) Nitrogen
(d) Nitric Oxide

Correct Answer: (a) Nitrous Oxide

Solution:Nitrous oxide (N₂O) is also called laughing gas. Smelling it in excessive quantity leads to a state of unconsciousness. For this reason, this gas is also used as an anesthetic. Dentists use nitrous oxide gas for painless therapy.

28. 'Nitrous Oxide' is the chemical name of _____ . [S.S.C. Online Graduate Level (T-I) 12.06.2019 (Shift-III) ]

(a) Tear Gas
(b) Mosquito Repellent
(c) Laughing Gas
(d) Fire Extinguisher

Correct Answer: (c) Laughing Gas

Solution:Nitrous oxide (N₂O) is also called laughing gas. Smelling it in excessive quantity leads to a state of unconsciousness. For this reason, this gas is also used as an anesthetic. Dentists use nitrous oxide gas for painless therapy.

29. Which of the following gases is referred to as 'laughing Gas'? [S.S.C. Online CHSL (T-I) 14.10.2020 (Shift-III) ]

(a) Carbon Dioxide
(b) Sulfur Dioxide
(c) Nitrous Oxide
(d) Carbon Monoxide

Correct Answer: (c) Nitrous Oxide

Solution:Nitrous oxide (N₂O) is also called laughing gas. Smelling it in excessive quantity leads to a state of unconsciousness. For this reason, this gas is also used as an anesthetic. Dentists use nitrous oxide gas for painless therapy.

30. What is the name of the substance that irritates the lacrimal glands? [C.P.O. S.I. 6.06.2016 (Shift-I) ]

(a) Tear gas
(b) laughing gas
(c) anesthetic gas
(d) noble gas

Correct Answer: (a) Tear gas

Solution:Tear gas (lachrymatory agent) is a chemical weapon that irritates the mucous membranes of the eyes, nose, mouth, and lungs, causing tearing, pain, breathing difficulties, and disorientation. It specifically stimulates the lacrimal glands to produce tears.

Chemistry (Part-XIII)

21. Methyl Propane is an isomer of: [S.S.C. Online Graduate Level (T-I) 4.06.2019 (Shift-I) ]

22. Benzene is _____ in Ethyl Alcohol. [S.S.C. Online CHSL (T-I) 25.01.2017 (Shift-II) ]

23. What is the main component of natural gas? [C.P.O. S.I. 5.06.2016 (Shift-I) ]

24. Which one of the following is the primary component of natural gas? [S.S.C. Online MTS (T-I) 18.10.2021 (Shift-III) ]

25. Which of the following is the largest component of natural gas? [S.S.C. Online MTS (T-I) 22.10.2021 (Shift-II) ]

26. Which of the following is used as an aesthetics? [S.S.C. Online Graduate Level (T-I) 1.09.2016 (Shift-III) ]

27. Which of the following gases is known as "Laughing Gas"? [S.S.C. Online Graduate Level (T-I) 10.09.2016 (Shift-III) ]

28. 'Nitrous Oxide' is the chemical name of _____ . [S.S.C. Online Graduate Level (T-I) 12.06.2019 (Shift-III) ]

29. Which of the following gases is referred to as 'laughing Gas'? [S.S.C. Online CHSL (T-I) 14.10.2020 (Shift-III) ]

30. What is the name of the substance that irritates the lacrimal glands? [C.P.O. S.I. 6.06.2016 (Shift-I) ]

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