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Class 10 Chemistry Chapter 12: Hydrocarbons MCQs With Explanations

Practice Class 10 Chemistry Chapter 12: Hydrocarbons MCQs with explanations for Pakistani board exams. Includes solved objective questions, answer checking, chapter revision guidance and next chapter suggestions.

MCQs / Class 10 / Chemistry / Chapter 12: Hydrocarbons
11 MCQs

Chapter 12: Hydrocarbons Objective Preparation

Use this page for direct chapter practice, answer checking and explanation review. It is available through the clean URL shown in the browser, so students can bookmark and share this exact chapter.

11Total MCQs
11With explanations
8Topics represented

Topics found: Chemical Warfare, Natural Gas, Paraffins, Olefins, Oxidation of Alkenes, Marsh Gas, Substitution Reactions, Alkanes

Hydrocarbons MCQs With Explanations

Q1. Which gas is used in chemical war?
Mustard gas (sulfur mustard) is a chemical warfare agent known for its blistering and toxic effects.
Q2. Percentage of methane in natural gas is:
Natural gas typically contains 70–90% methane, with 85% being a commonly cited average value.
Q3. Paraffins means:
Paraffins (alkanes) are called so because they exhibit little to no reactivity due to strong C-C and C-H single bonds.
Q4. Which one is also called olefins:
Olefins is an older term for alkenes, hydrocarbons with at least one carbon-carbon double bond.
Q5. Oxidation of alkenes produce:
Oxidation of alkenes with cold, dilute KMnO₄ produces vicinal diols (glycols) via syn hydroxylation.
Q6. Marsh gas consists mostly of:
Marsh gas is primarily methane, produced by anaerobic decomposition of organic matter in wetlands.
Q7. Which is substitution reaction?
Halogenation of alkanes proceeds via free radical substitution, the classic example of a substitution reaction in organic chemistry.
Q8. Molecular formula of Butane is:
Butane is a saturated alkane with four carbon atoms, requiring ten hydrogen atoms to satisfy valency, giving C₄H₁₀.
Q9. The general formula of Alkene is:
Alkenes contain one double bond, reducing hydrogen count by two compared to alkanes, giving the general formula CₙH₂ₙ.
Q10. The general formula of Alkane is:
Alkanes are saturated hydrocarbons with the general formula CₙH₂ₙ₊₂ due to single bonds and maximum hydrogen saturation.
Q11. Which is lighter than air?
Ethene (C₂H₄) has a molecular weight of 28 g/mol, lighter than air (avg. 29 g/mol), while the others are solids or liquids, not gases lighter than air.

After Chapter 12: Hydrocarbons, Practice Next Chapters

Once you finish these MCQs, continue with the next available chapters from Chemistry so your revision stays chapter-wise and complete.

Chapter 12: Hydrocarbons Revision Guide

Complete the MCQs first, then review every incorrect answer against the textbook heading where that concept appears. For biology and other science subjects, pay attention to terminology, diagrams, sequence of processes, examples and differences between similar structures or functions.

This chapter page keeps the exact class, subject, chapter, question count, answer checking, explanations and follow-up chapters together, so students can revise from one focused URL instead of searching through the full book again.

Class 10 Chemistry MCQ Preparation: Hydrocarbons

This page supports Matric Part 2 practice in Chemistry. At this stage, the main purpose is strengthening final-year matric concepts and preparing for cumulative school and board assessments. The questions available here should be used with the current textbook and the instructions issued by the learner's school or examination board.

What Chemistry MCQs can test

In Chemistry, objective questions commonly draw on chemical symbols, atomic structure, periodic trends, bonding, equations, reaction conditions, laboratory observations and calculations. A useful answer is based on the exact wording and concept, not simply on recognising a familiar option. For this subject, learners should connect each chemical fact with a particle-level explanation and check symbols, charges, valencies and equation balance carefully.

Hydrocarbons: what to focus on

Particles, structures, symbols, trends, equations, reaction conditions and the reasons substances behave differently.

Write the relevant symbol, structure or balanced equation and compare each option with the rule demonstrated by it.

Common mistakes for Class 10 learners

In this subject, frequent errors include confusing related trends, using an incorrect chemical symbol, missing a reaction condition or treating similar compounds as identical. Review textbook exceptions, diagrams, units and similar-looking statements because these often cause avoidable objective-question errors. When the page marks an answer as incorrect, the next step should be to identify the mistaken idea and verify it, rather than memorising the displayed answer letter.

A practical revision routine

Alternate chapter revision with short mixed tests so that older material remains active while new chapters are completed. Before attempting the MCQs, review definitions, equations, periodic relationships, structures, reaction conditions, examples and exceptions stated in the textbook. Complete a manageable set without notes, check the result, and divide errors into missing knowledge, misunderstood concepts and careless reading. Revise the appropriate section before repeating the chapter.

How to review Hydrocarbons after the quiz

List the questions you missed from Hydrocarbons and write the textbook heading connected with each one. Explain the correct idea in your own words, then return later and answer a fresh set. This gives the chapter page a clear purpose: finding specific weaknesses in Chemistry rather than only collecting a score.

Accuracy and responsible use

Explanations are provided where they exist in the question bank, but educational databases can contain incomplete or mistaken material. Confirm disputed answers with an authoritative textbook or teacher. Ahmad Learning Hub provides a practice resource and does not claim that a question will appear in an examination or that every available item represents an official board question.