Q1. A substance is oxidised if it: A. Gains hydrogen ❌B. Loses oxygen ❌C. Gains oxygen ✅D. Gains water ❌Why correct: Oxidation means gain of oxygen.Why others wrong: Gaining hydrogen or losing oxygen means reduction; water has no role. Q2. A substance is reduced if it: A. Gains oxygen ❌B. Loses oxygen ✅C. Gains nitrogen […]
Chemistry 10th iv explanation Read More »
Q1. Heating lead nitrate produces brown fumes of: A. Nitric oxide ❌B. Nitrogen monoxide ❌C. Nitrogen dioxide ✅D. Nitrous oxide ❌Why correct: Nitrogen dioxide is brown.Why others wrong: The others are colorless gases. Q2. Brown coloured gas NO₂ is: A. Nitrous oxide ❌B. Nitrogen monoxide ❌C. Nitrogen dioxide ✅D. Nitric oxide ❌Why correct: NO₂ is
Q1. What happens when milk is left at room temperature during summers? A. It freezes ❌B. It evaporates ❌C. It undergoes a chemical reaction ✅D. It becomes salty ❌ Why correct: Milk turns sour due to formation of new substances.Why others wrong: No freezing, evaporation, or salting occurs. Q2. What change occurs when an iron
Q1. The balanced equation 3Fe + 4H₂O → Fe₃O₄ + 4H₂ uses water as: A. Liquid ❌B. Solid ❌C. Steam ✅D. Ice ❌ Why correct: The reaction occurs with steam, not liquid water.Why others wrong: Liquid/solid/ice forms do not react like this with iron. Q2. Symbol (g) represents: A. Graph ❌B. Gravity ❌C. Gas ✅D.
📌 How to Use First read the questions carefully using the Read section. Use the Details button to understand concepts clearly. After completing reading, click Practice Quiz to test yourself. 📘 Read📝 Practice Quiz 📘 Study MCQs Q1. What type of reaction occurs when calcium oxide and water combine to form a single product, calcium
📌 How to Use First read the questions carefully using the Read section. Use the Details button to understand concepts clearly. After completing reading, click Practice Quiz to test yourself. 📘 Read📝 Practice Quiz 📘 Study MCQs Q1. What happens when copper powder is heated in air? • It melts. • It turns white. •
Chemistry MCQ Quiz – Part 1 0/50 Questions Answered Reset & Reshuffle Show Results Reveal Answers Quiz Results – Part 1 × 0 Total Questions 0 Attempted 0 Unattempted 0 Correct 0 Wrong 0% Percentage – Grade 0 Reshuffles Your Name Date Share via Email Download Summary (CSV)
📌 How to Use First read the questions carefully using the Read section. Use the Details button to understand concepts clearly. After completing reading, click Practice Quiz to test yourself. 📘 Read📝 Practice Quiz 📘 Study MCQs Q1. What happens when ferrous sulphate crystals are heated strongly? • They melt without any change. • They
📌 How to Use First read the questions carefully using the Read section. Use the Details button to understand concepts clearly. After completing reading, click Practice Quiz to test yourself. 📘 Read📝 Practice Quiz 📘 Study MCQs Q1. What helps us determine that a chemical reaction has taken place? • Only a change in state
📌 How to Use First read the questions carefully using the Read section. Use the Details button to understand concepts clearly. After completing reading, click Practice Quiz to test yourself. 📘 Read📝 Practice Quiz 📘 Study MCQs Q1. What is a chemical equation? • A statement of physical change • A representation of a chemical
