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Class 10 · Science
→Why is the volume of hydrogen gas greater than the volume of oxygen gas during electrolysis of water?
Class 10 · Science
→When lead nitrate is heated, brown nitrogen dioxide gas is formed. What type of reaction is this?
Class 10 · Science
→Which products are formed when calcium carbonate is heated?
Class 10 · Science
→Which observation indicates that a reaction occurs when aqueous barium chloride and sodium sulphate solutions are mixed?
Class 10 · Science
→In which of the following mixtures will a metal displacement reaction not occur?
Class 10 · Science
→When an iron nail is placed in a blue copper sulphate solution, what is the main reason the solution turns green?
Class 10 · Science
→In a closed system, the total mass before and after a reaction remains the same, but the properties of the substances change. What is the correct conclusion?
Class 10 · Science
→In an unknown reaction, a white solid forms and does not dissolve in water. What is the most suitable identification?
Class 10 · Science
→If a packaged food item contains a large amount of oil or fat, which method is most suitable to prevent rancidity?
Class 10 · Science
→A student placed an iron nail in a blue copper sulphate solution. After some time, a reddish-brown coating formed on the nail and the solution began to turn green. What type of reaction is this?
Class 10 · Science
→Which of the following reactions is both a combination reaction and an exothermic reaction?
Class 10 · Science
→Which of the following reactions is not a displacement reaction?
Class 10 · Science
→Why is photosynthesis considered an energy-absorbing (endothermic) process?
Class 10 · Science
→What is the correct reason for calling respiration an exothermic chemical reaction?
Class 10 · Science
→Why is digestion of food considered a chemical reaction?
Class 10 · Science
→If only the shape of a substance changes in a process and no new substance is formed, what type of change is it called?
Class 10 · Science
→Why should a colour change alone not be considered conclusive evidence of a chemical reaction?
Class 10 · Science
→When is the law of conservation of mass correctly applied in a chemical equation?
Class 10 · Science
→After converting a word equation into a chemical equation, what is the next main task?
Class 10 · Science
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