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📘 Study MCQs Q1. Substances capable of adding oxygen to others are called: A. Reducing agents B. Indicators C. Oxidising agents D. Catalysts AnswerC. Oxidising agentsDetails CloseAn oxidising agent (or oxidant) is a substance that adds oxygen to another substance or removes hydrogen from it. In the process, the oxidising agent itself gets reduced. Examples:

📘 Study MCQs Q1. Combustion of carbon produces: A. Carbon monoxide only B. Carbon dioxide only C. Carbon and smoke D. Carbon dioxide with heat and light AnswerD. Carbon dioxide with heat and lightDetails CloseCombustion is an exothermic chemical reaction where a substance reacts with oxygen, releasing heat and light. When carbon (or carbon compounds)

📘 Study MCQs Q1. Functional groups determine: A. Atomic mass B. Chemical nature C. Density D. Shape of molecule AnswerB. Chemical natureDetails CloseA functional group is an atom or group of atoms that is responsible for the characteristic chemical reactions of a compound. For example, –OH (alcohol) gives different properties than –COOH (carboxylic acid), even

📘 Study MCQs Q1. Replacement of hydrogen does not change: A. Valency of carbon B. Atomic mass C. Reactivity D. Structure AnswerA. Valency of carbonDetails CloseWhen one hydrogen atom in a hydrocarbon is replaced by another atom or group (e.g., –OH, –Cl), carbon’s valency remains 4 because it still forms four bonds. The atomic mass

📘 Study MCQs Q1. Carbon forms compounds with all except: A. Oxygen B. Helium C. Nitrogen D. Hydrogen AnswerB. HeliumDetails CloseHelium is a noble gas with a completely filled outer shell (2 electrons). It is chemically inert and does not form bonds with any element, including carbon. Oxygen, nitrogen, and hydrogen readily form covalent compounds

📘 Study MCQs Q1. Molecular formula of chlorine gas is: A. Cl₂ B. Cl₄ C. Cl D. Cl₃ AnswerA. Cl₂Details CloseChlorine is a diatomic molecule because it is highly reactive and exists as a pair of atoms sharing one covalent bond. This stable Cl₂ molecule allows each chlorine atom to complete its octet. Q2. Which