MPSC PYQ

Hydrocarbons

Hydrocarbons is a Science & Technology concept from the MPSC syllabus, tested in 4 past MPSC questions (2018, 2023, 2025). Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.

Real questions
4
Years tested
3 · 2018–2025
In context
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What you need to know first

Atomic massesMolecular formulaBasic organic compounds

Real questions that test this

खालीलपैकी कोणत्या हायड्रोकार्बनमध्ये 80% कार्बन असतो ? (H = 1, C = 12) Which of the following hydrocarbon has 80% carbon ? (H = 1, C = 12)

a)बेंझीन / Benzene
b)मीथेन / Methane
c)इथेन / Ethane✓ Correct
d)सायक्लोहेक्झेन / Cyclohexane

Percentage composition by mass = (mass of carbon / molar mass) x 100. Ethane (C2H6): molar mass = 2(12) + 6(1) = 30. %C = 24/30 x 100 = 80%. For comparison: Methane (CH4) is 75% C, Benzene (C6H6) is 92.3% C, Cyclohexane (C6H12) is 85.7% C -- only Ethane matches the given 80%.

नैसर्गिक वायुमध्ये ___________ चे प्रमाण मुख्यत्वे करून असते. / Natural gas mainly consists of

1)ब्युटेन / Butane
2)प्रोपेन / Propane
3)मिथेन / Methane✓ Correct
4)ईथेन / Ethane

Natural gas is a naturally occurring hydrocarbon gas mixture consisting primarily of Methane (CH4), often up to 70-90% of its composition.

Carbon compounds are broadly classified into two main categories : 1. Organic compounds : These contain carbon and hydrogen and may also include other elements like oxygen, nitrogen, sulfur etc. They include hydrocarbons (such as methane, ethane, propane), alcohols, acids and polymers (like plastics, rubber). Organic compounds are essential in biological systems, forming the basis of molecules like proteins, carbohydrates, lipids and nucleic acids (DNA and RNA). They are also used widely in industries for example, in the manufacture of fuels, dyes, medicines, pesticides and plastics. 2. Inorganic compounds : These include compounds like Carbon dioxide (CO2), Carbon Monoxide (CO), carbonates (such as calcium carbonate in limestone) and bicarbonates. These compounds are vital in geological and environmental processes, such as the carbon cycle, which maintains the balance of carbon in the eco-system. Carbon compounds exhibit various properties, most organic compounds have low melting and boiling points, are generally flammable and more soluble in organic solvents rather than water. This makes them useful as fuels and industrial solvents. Their diversity and reactivity make them a central part of the field of chemistry, particularly in synthetic and pharmaceutical industries.

कार्बन डायऑक्साइड आणि कार्बोनेट्स् कोणत्या प्रकारची संयुगे आहेत ? / Carbon dioxide and carbonates are which types of compounds ?

1)सेंद्रिय संयुगे / Organic compounds
2)असेंद्रिय संयुगे / Inorganic compounds✓ Correct
3)धातवीय संयुगे / Metallic compounds
4)आण्विक संयुगे / Nuclear compounds

Carbon dioxide and carbonates are classified as inorganic compounds despite containing carbon, because they do not possess carbon-hydrogen (C-H) bonds typical of organic molecules.

Carbon compounds are broadly classified into two main categories : 1. Organic compounds : These contain carbon and hydrogen and may also include other elements like oxygen, nitrogen, sulfur etc. They include hydrocarbons (such as methane, ethane, propane), alcohols, acids and polymers (like plastics, rubber). Organic compounds are essential in biological systems, forming the basis of molecules like proteins, carbohydrates, lipids and nucleic acids (DNA and RNA). They are also used widely in industries for example, in the manufacture of fuels, dyes, medicines, pesticides and plastics. 2. Inorganic compounds : These include compounds like Carbon dioxide (CO2), Carbon Monoxide (CO), carbonates (such as calcium carbonate in limestone) and bicarbonates. These compounds are vital in geological and environmental processes, such as the carbon cycle, which maintains the balance of carbon in the eco-system. Carbon compounds exhibit various properties, most organic compounds have low melting and boiling points, are generally flammable and more soluble in organic solvents rather than water. This makes them useful as fuels and industrial solvents. Their diversity and reactivity make them a central part of the field of chemistry, particularly in synthetic and pharmaceutical industries.

खालीलपैकी कोणत्या गुणधर्मामुळे कार्बन अनेक संयुगे तयार करू शकतो ? Which of the following properties makes carbon capable of forming many compounds ?

1)जास्त अणुभार / High atomic mass
2)आयनिक बंध तयार करण्याची क्षमता / Ability to form ionic bonds
3)चतुष्क-संयोजकता आणि कॅटनेशन / Tetravalency and catenation✓ Correct
4)विकिरणशील स्वरूप / Radioactive nature

Carbon forms a massive number of compounds due to its tetravalency (valency of 4) and catenation (the unique ability to form long chains with other carbon atoms).

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