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Class 10 · Science · Medium
→Why is a combustion reaction generally considered exothermic?
Class 10 · Science · Easy
→When two or more reactants combine to form a single product, which type of reaction is it?
Class 10 · Science · Easy
→If a chemical reaction produces two or more products from a single reactant, what type of reaction is it?
Class 10 · Science · Medium
→Which observation is the most suitable indicator of a precipitation reaction?
Class 10 · Science · Medium
→What is the correct difference between melting of ice and burning of a candle?
Class 10 · Science · Medium
→Which of the following changes is the best example of a chemical change?
Class 10 · Science · Medium
→Why are antioxidants added to food materials to prevent rancidity?
Class 10 · Science · Medium
→What is the scientific reason for filling potato chips packets with nitrogen gas?
Class 10 · Science · Medium
→A white sample of silver chloride turns grey when kept in sunlight. Which equation correctly represents this change?
Class 10 · Science · Medium
→What role do air and moisture play in the rusting of iron?
Class 10 · Science · Medium
→What is a reaction called in which one substance gains oxygen and another substance loses oxygen?
Class 10 · Science · Medium
→In the reaction CuO + H₂ → Cu + H₂O, which process occurs to hydrogen?
Class 10 · Science · Medium
→When copper oxide is heated with hydrogen, copper is formed. Which process occurs to copper oxide in this reaction?
Class 10 · Science · Medium
→When an aqueous solution of barium chloride is mixed with an aqueous solution of sodium sulphate, a white precipitate is formed. What type of reaction is this?
Class 10 · Science · Medium
→While heating lead nitrate, a student identified the evolved brown gas as oxygen. What is the correct correction to the student's statement?
Class 10 · Science · Medium
→When a zinc strip is placed in copper sulphate solution, which statement is correct?
Class 10 · Science · Medium
→Why does the blue colour of copper sulphate solution fade and turn green when an iron nail is added?
Class 10 · Science · Medium
→What is the ratio of the volumes of hydrogen and oxygen gases collected during the electrolysis of water?
Class 10 · Science · Medium
→Silver chloride turns grey when kept in sunlight. What is the correct reason?
Class 10 · Science · Medium
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