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Class 10 · Science · Medium
→In an unknown reaction, a white solid forms and does not dissolve in water. What is the most suitable identification?
Class 10 · Science · Medium
→If a packaged food item contains a large amount of oil or fat, which method is most suitable to prevent rancidity?
Class 10 · Science · Medium
→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 · Medium
→Which of the following reactions is both a combination reaction and an exothermic reaction?
Class 10 · Science · Medium
→Which of the following reactions is not a displacement reaction?
Class 10 · Science · Medium
→Why is photosynthesis considered an energy-absorbing (endothermic) process?
Class 10 · Science · Medium
→What is the correct reason for calling respiration an exothermic chemical reaction?
Class 10 · Science · Medium
→Why is digestion of food considered a chemical reaction?
Class 10 · Science · Easy
→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 · Medium
→Why should a colour change alone not be considered conclusive evidence of a chemical reaction?
Class 10 · Science · Medium
→When is the law of conservation of mass correctly applied in a chemical equation?
Class 10 · Science · Medium
→After converting a word equation into a chemical equation, what is the next main task?
Class 10 · Science · Medium
→What is the reaction called in which a more reactive metal displaces a less reactive metal from its salt solution?
Class 10 · Science · Medium
→A student places a clean iron nail in blue copper sulfate solution. Which observation confirms that a displacement reaction has occurred?
Class 10 · Science · Medium
→Why is an upward arrow associated with gas in a chemical equation?
Class 10 · Science · Easy
→In a chemical reaction, both heat and light are released. What type of reaction is it?
Class 10 · Science · Medium
→If a container becomes cold during a reaction, what can it indicate?
Class 10 · Science · Easy
→When bubbles are observed in a reaction mixture, what do they most commonly indicate?
Class 10 · Science · Medium
→Why is the conversion of milk into curd a chemical change?
Class 10 · Science · Easy
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