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.
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