Carbon : An important element — Important Questions
Maharashtra Board · Class 9 · Science
43 important questions from Carbon : An important element for Maharashtra Board Class 9 Science, with answers.
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Important Questions from Carbon : An important element
Which of the following are crystalline allotropes of carbon?
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Diamond, Graphite, Fullerene
Diamond, graphite, and fullerene are crystalline allotropes with regular atomic arrangements. Coal and charcoal are amorphous forms with irregular arrangements.
Which of the following reactions produce carbon dioxide?
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Burning of coal, Respiration in animals, Reaction of CaCO₃ with HCl
Coal burning, respiration, and acid reaction with carbonates all produce CO₂. Photosynthesis uses CO₂ to make oxygen and glucose.
What happens when carbon dioxide is passed through limewater?
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It turns milky
CO₂ reacts with calcium hydroxide in limewater to form insoluble calcium carbonate, which makes the solution milky: Ca(OH)₂ + CO₂ → CaCO₃ + H₂O
What is the molecular formula of methane?
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CH₄
Methane has one carbon atom bonded to four hydrogen atoms, giving it the formula CH₄. It's the simplest hydrocarbon.
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