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Q51. Black colour on silver is due to: A. Oxide ❌B. Sulphide ✅C. Chloride ❌D. Nitrate ❌Why correct: Silver reacts with sulphur to form black silver sulphide.Why others wrong: Oxide, chloride and nitrate do not cause black colour. Q52. Green colour on copper forms due to: A. Oxide ❌B. Carbonate ✅C. Chloride ❌D. Sulphide ❌Why

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

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.

📘 Study MCQs Q1. What type of reaction occurs when calcium oxide and water combine to form a single product, calcium hydroxide? A. Decomposition reaction B. Displacement reaction C. Combination reaction D. Double displacement reaction AnswerC. Combination reactionDetails A combination reaction is defined as a reaction where two or more substances combine to form a

📘 Study MCQs Q1. What happens when copper powder is heated in air? A. It melts. B. It turns white. C. Its surface gets coated with black copper(II) oxide. D. It evaporates. AnswerC. Its surface gets coated with black copper(II) oxide.Details CloseWhen copper powder is heated in air, it reacts with oxygen to form copper(II)

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📘 Study MCQs Q1. What happens when ferrous sulphate crystals are heated strongly? A. They melt without any change. B. They change colour and decompose into simpler products. C. They combine with oxygen to form a new compound. D. They dissolve into a liquid. AnswerB. They change colour and decompose into simpler products.Details CloseWhen ferrous