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📘 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

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Exam Q1. The primary function of red blood cells is to: A. Fight infection B. Transport oxygen C. Clot blood D. Produce antibodies Q2. Which of the following is a renewable resource? A. Coal B. Natural gas C. Solar energy D. Oil Q3. Coca alkaloids increase alertness by stimulating the: A. Heart only B. Brain

Exam Q1. The primary function of red blood cells is to: A. Fight infection B. Transport oxygen C. Clot blood D. Produce antibodies Q2. Which of the following is a renewable resource? A. Coal B. Natural gas C. Solar energy D. Oil Q3. Coca alkaloids increase alertness by stimulating the: A. Heart only B. Brain

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📘 Study MCQs Q1. Green coating on copper is an example of: A. Oxidation only B. Rancidity C. Rust D. Corrosion AnswerD. CorrosionDetails CloseWhen copper is exposed to moist air for a long time, it reacts with carbon dioxide and water to form a green coating of basic copper carbonate. This gradual destruction of metal