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Class 10 · Science · Medium
→What do state symbols such as \((s)\), \((l)\), \((g)\), and \((aq)\) indicate in a chemical equation?
Class 10 · Science · Medium
→When two aqueous solutions are mixed and an insoluble solid forms, what is the most appropriate conclusion?
Class 10 · Science · Medium
→In which example does a colour change occur along with the formation of new substances?
Class 10 · Science · Medium
→How does melting of ice differ from electrolysis of water?
Class 10 · Science · Medium
→What is the similarity between digestion of food and formation of curd from milk?
Class 10 · Science · Medium
→Why is the breakdown of glucose during aerobic respiration a chemical reaction?
Class 10 · Science · Medium
→What type of change occurs when glucose is formed from carbon dioxide and water during photosynthesis?
Class 10 · Science · Medium
→Which statement correctly distinguishes exothermic and endothermic reactions?
Class 10 · Science · Medium
→During a chemical reaction, gas evolves and the container feels warm without external heating. What is the most appropriate conclusion?
Class 10 · Science · Medium
→What is the importance of temperature change in identifying a chemical reaction?
Class 10 · Science · Medium
→What effect do airtight packaging and filling a packet with nitrogen gas have on rancidity?
Class 10 · Science · Medium
→Why does rancidity increase when oily food is kept in open air?
Class 10 · Science · Medium
→Why does the likelihood of rusting increase when the zinc coating in galvanisation is removed?
Class 10 · Science · Medium
→Why does an iron object rust less when kept in an airtight, dry container?
Class 10 · Science · Easy
→Why is rusting of iron considered a chemical change?
Class 10 · Science · Easy
→If hydrogen is removed from a substance, which process is it generally considered to be?
Class 10 · Science · Medium
→If hydrogen is added to a substance, which process is it generally called?
Class 10 · Science · Medium
→A student places a clean iron nail in a blue copper sulphate solution. After some time, the solution turns green and a reddish-brown coating appears on the nail. What is the correct conclusion from this experiment?
Class 10 · Science · Medium
→Which of the following chemical equations represents a displacement reaction?
Class 10 · Science · Medium
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