Chapter 1 (Stoichiometry) is one of the most important chapters in ECAT Chemistry. Every year, multiple questions appear from this chapter in the actual exam. Practice these solved MCQs covering Mole Concept, Avogadro's Number, Empirical & Molecular Formulas, Limiting Reagent to strengthen your preparation. All questions include correct answers and detailed explanations written by experts.
We have carefully curated MCQs from Chapter 1 (Stoichiometry) following the official ECAT 2026 syllabus. Each question comes with the correct answer and detailed explanation.
Practice Chemistry MCQs Now Take Full ECAT Mock TestBelow are important MCQs from ECAT Chemistry Chapter 1 (Stoichiometry). Each question includes the correct answer highlighted in green and a detailed explanation to help you understand the concept.
Avogadro's number (6.022 x 10^23) = particles in one mole. This fundamental constant connects atomic and macroscopic scales.
Dividing all subscripts by 6 gives CH2O as the simplest whole number ratio of atoms in glucose.
The limiting reagent is consumed first, determining the maximum amount of product formed. Other reagents are in excess.
Molar mass H2O = 18. Mass of O = 16. (16/18) x 100 = 88.9%. Hydrogen = 11.1%.
Balanced equations conserve both mass (same atoms each side) and charge (equal total charge), following Conservation of Mass.
Empirical mass = 30. Factor = 180/30 = 6. Molecular formula = C6H12O6 (glucose).
NA = 6.022 x 10^23 = number of particles in one mole of any substance.
CH4 + 2O2 -> CO2 + 2H2O. 1:1 ratio means 2 mol CH4 produces 2 mol CO2.
CH4 = 5 atoms/molecule (1C + 4H), CO2 = 3, H2O = 3, O2 = 2. So 1 mol CH4 has most atoms.
NaCl = Na(23) + Cl(35.5) = 58.5 g/mol.
Our full question bank has 100+ MCQs for this chapter alone. Practice in quiz mode with instant scoring, timer, and detailed performance analytics.
Start Full Quiz ModeStoichiometry is a fundamental chapter in ECAT Chemistry. This chapter covers the following important topics that frequently appear in the ECAT exam:
By practicing these MCQs, you will develop a strong understanding of Stoichiometry concepts and be well-prepared for the ECAT 2026 exam.
Follow these expert tips to master Stoichiometry and score maximum marks in ECAT:
Based on analysis of past ECAT papers, these topics from Chapter 1 (Stoichiometry) are most frequently tested:
This Chemistry chapter is also tested in other Pakistani entry tests. Practice the same topics with exam-specific focus:
In ECAT, Chemistry typically has 100 total MCQs. Chapter 1 (Stoichiometry) usually contributes 3-5 MCQs in the actual exam. On Apna MCQs, we provide 10+ practice MCQs with detailed explanations for thorough preparation.
Yes! All MCQs on Apna MCQs are updated according to the latest Various Universities ECAT 2026 syllabus. Our team of expert educators regularly reviews and adds new questions based on the latest exam patterns and past papers.
Our Stoichiometry MCQs cover all important topics including Mole Concept, Avogadro's Number, Empirical & Molecular Formulas and more. Each topic has multiple MCQs ranging from easy to hard difficulty to ensure comprehensive preparation.
To prepare Stoichiometry for ECAT: 1) Read the textbook thoroughly, 2) Make notes of key concepts, 3) Practice MCQs on Apna MCQs with explanations, 4) Take mock tests, 5) Review weak areas. Our chapter-wise approach ensures you cover all 21 chapters systematically.
After completing Chapter 1, move to the next chapter on Apna MCQs. We cover all 21 chapters of Chemistry with chapter-wise MCQs. You can also take full-length ECAT mock tests for timed practice.
Our MCQs include questions modeled on ECAT past papers as well as original questions created by subject experts. The questions cover all topics in Stoichiometry that are part of the official ECAT syllabus.
Absolutely! While these MCQs are organized for ECAT preparation, the content covers the same Chemistry Chapter 1 (Stoichiometry) topics tested in FSc/Inter board exams. Many students use Apna MCQs for both board and entry test preparation.
Yes! Apna MCQs provides free access to chapter-wise MCQs for MDCAT, ECAT, LAT, IBA, Nursing and other entry tests. We believe quality education should be accessible to every student in Pakistan.
