CBSE Class 10 Chemistry Carbon and its Compounds MCQs Set 04

Chemistry Objective Questions and Answers: Carbon and its Compounds

Review structured MCQ sets for Class 10 Chemistry Carbon and its Compounds. Built according to official CBSE guidelines, these downloadable questions support daily revision and core concept reinforcement.

Download Carbon and its Compounds MCQs with Answers

View or download the dedicated Carbon and its Compounds MCQ resource below. Practicing these 50 objective questions regularly builds familiarity with standard exam patterns and helps secure higher marks in final Chemistry evaluations.

Multiple Choice Questions

Question 1: The first organic compound synthesised in the laboratory was
(a) acetic acid
(b) methane
(c) urea
(d) ethyl alcohol
Show Answer & Explanation

Answer: (c) urea

Explanation:
1. Wohler (1828) prepared urea from ammonium cyanate, disproving the vital force theory.

Teacher's Note:
1. Ammonium cyanate changes to urea on heating.
2. This broke the barrier between organic and inorganic chemistry.

Question 2: Marsh gas mainly contains
(a) C₂H₂
(b) H₂S
(c) CO
(d) CH₄
Show Answer & Explanation

Answer: (d) CH₄

Explanation:
1. Methane forms by decay of plants under water in marshes, so it is called marsh gas.

Teacher's Note:
1. It is also the main constituent of natural gas and biogas.
2. Fire-damp in coal mines is mostly methane.

Question 3: Compounds whose molecular formulae differ by a CH₂ unit are called
(a) homologues
(b) isomers
(c) allotropes
(d) polymers
Show Answer & Explanation

Answer: (a) homologues

Explanation:
1. A homologous series is a family of compounds in which successive members differ by CH₂.

Teacher's Note:
1. Isomers have the same formula but different structures.
2. Examples: CH₄, C₂H₆, C₃H₈.

Question 4: Which of the following decolourises alkaline KMnO₄?
(a) C₃H₈
(b) C₂H₄
(c) CH₄
(d) CCl₄
Show Answer & Explanation

Answer: (b) C₂H₄

Explanation:
1. Ethene is unsaturated and is oxidised by alkaline KMnO₄ (Baeyer's reagent), turning the purple colour to colourless/brown.
2. Saturated compounds do not react.

Teacher's Note:
1. Decolourisation of KMnO₄ is a test for unsaturation.
2. Bromine water gives the same test.

Question 5: When ethyl alcohol is heated with concentrated H₂SO₄ at about 170°C the product is
(a) CH₃COCH₃
(b) C₂H₆
(c) C₂H₄
(d) C₂H₂
Show Answer & Explanation

Answer: (c) C₂H₄

Explanation:
1. Concentrated sulphuric acid removes water from ethanol (dehydration).
2. C₂H₅OH → C₂H₄ + H₂O.

Teacher's Note:
1. At 140°C the product is ether instead.
2. Conc. H₂SO₄ is a dehydrating agent.

Question 6: Acetylene polymerises (when passed through a red-hot tube) to form
(a) butane
(b) polyethene
(c) hexane
(d) benzene
Show Answer & Explanation

Answer: (d) benzene

Explanation:
1. Three molecules of ethyne combine: 3C₂H₂ → C₆H₆.

Teacher's Note:
1. This is a cyclic polymerisation.
2. It was the first synthesis of an aromatic compound from an alkyne.

Question 7: Sodium propionate heated with soda lime gives
(a) ethane
(b) methane
(c) ethylene
(d) acetylene
Show Answer & Explanation

Answer: (a) ethane

Explanation:
1. CH₃CH₂COONa + NaOH → CH₃CH₃ + Na₂CO₃.
2. Decarboxylation removes one carbon as carbonate.

Teacher's Note:
1. The product has one carbon atom less than the acid salt.
2. Sodium acetate gives methane in the same way.

Question 8: The insecticide gammexane is a formulation based on
(a) DDT
(b) benzene hexachloride
(c) hexachloroethane
(d) chloral
Show Answer & Explanation

Answer: (b) benzene hexachloride

Explanation:
1. Gammexane (lindane) is the gamma isomer of benzene hexachloride, C₆H₆Cl₆, formed by the addition of chlorine to benzene in sunlight.

Teacher's Note:
1. Chlorine adds to benzene in sunlight, but substitutes in the dark with a catalyst.
2. BHC is also called 666.

Question 9: Calcium carbide reacts with water to produce
(a) methane
(b) ethane
(c) acetylene
(d) ethylene
Show Answer & Explanation

Answer: (c) acetylene

Explanation:
1. CaC₂ + 2H₂O → Ca(OH)₂ + C₂H₂.

Teacher's Note:
1. This is the laboratory and industrial method for ethyne.
2. Aluminium carbide gives methane with water.

Question 10: Petrol is a mixture containing mainly
(a) alcohols
(b) carbohydrates
(c) carboxylic acids
(d) hydrocarbons
Show Answer & Explanation

Answer: (d) hydrocarbons

Explanation:
1. Petrol is a fraction of crude oil containing hydrocarbons with about 5 to 10 carbon atoms (mostly alkanes).

Teacher's Note:
1. Crude oil is a mixture of many hydrocarbons.
2. Fractional distillation separates it.

Question 11: Which hydrocarbon is formed when aluminium carbide reacts with water?
(a) methane
(b) ethane
(c) ethylene
(d) acetylene
Show Answer & Explanation

Answer: (a) methane

Explanation:
1. Al₄C₃ + 12H₂O → 4Al(OH)₃ + 3CH₄.

Teacher's Note:
1. Carbides that contain C⁴⁻ give methane.
2. CaC₂ contains C₂²⁻ and gives acetylene.

Question 12: A gas decolourises alkaline KMnO₄ but gives no precipitate with ammoniacal AgNO₃. The gas is
(a) methane
(b) ethylene
(c) ethane
(d) acetylene
Show Answer & Explanation

Answer: (b) ethylene

Explanation:
1. Decolourising alkaline KMnO₄ shows unsaturation (ethylene or acetylene).
2. Acetylene would give a white precipitate of silver acetylide, so the gas is ethylene.

Teacher's Note:
1. Terminal alkynes react with ammoniacal silver nitrate.
2. Alkenes do not.

Free study material for Science

Multiple Choice Questions (MCQs) for Class 10 Chemistry Carbon and its Compounds

About Carbon and its Compounds MCQs for Class 10 Chemistry

Explore reliable practice questions for Carbon and its Compounds tailored for Class 10 Chemistry learners. Use these multiple-choice formats to evaluate preparedness and strengthen problem-solving skills.

How to Verify Your MCQ Answers

Built using the official NCERT book for Class 10, these Chemistry objective sets provide reliable academic guidance. Pair your practice with our recommended NCERT solutions to master optimal problem-solving approaches.

Enhance Speed with Online MCQ Tests

Explore our broader library of printable assignments, chapter notes, and mock tests designed to support continuous revision and secure higher marks in CBSE assessments.

FAQs

Where can I access latest CBSE Class 10 Chemistry Carbon and its Compounds MCQs Set 04?

You can get most exhaustive CBSE Class 10 Chemistry Carbon and its Compounds MCQs Set 04 for free on StudiesToday.com. These MCQs for Class 10 Chemistry are updated for the 2026-27 academic session as per CBSE examination standards.

Are Assertion-Reasoning and Case-Study MCQs included in the Chemistry Class 10 material?

Yes, our CBSE Class 10 Chemistry Carbon and its Compounds MCQs Set 04 include the latest type of questions, such as Assertion-Reasoning and Case-based MCQs. 50% of the CBSE paper is now competency-based.

How do practicing Chemistry MCQs help in scoring full marks in Class 10 exams?

By solving our CBSE Class 10 Chemistry Carbon and its Compounds MCQs Set 04, Class 10 students can improve their accuracy and speed which is important as objective questions provide a chance to secure 100% marks in the Chemistry.

Do you provide answers and explanations for CBSE Class 10 Chemistry Carbon and its Compounds MCQs Set 04?

Yes, Chemistry MCQs for Class 10 have answer key and brief explanations to help students understand logic behind the correct option as its important for 2026 competency-focused CBSE exams.

Can I practice these Chemistry Class 10 MCQs online?

Yes, you can also access online interactive tests for CBSE Class 10 Chemistry Carbon and its Compounds MCQs Set 04 on StudiesToday.com as they provide instant answers and score to help you track your progress in Chemistry.