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Class 10 · Science · Medium
→In which type of decomposition reaction does light energy help break down a compound?
Class 10 · Science · Medium
→When water is added to a coloured solution, its colour becomes lighter, but no new substance is formed. What does this change represent?
Class 10 · Science · Medium
→Which statement correctly explains the relation between oxidation and reduction?
Class 10 · Science · Medium
→In the equation of which type of reaction is writing state symbols such as (aq) and (s) especially useful to show that a solid product has separated from a solution?
Class 10 · Science · Medium
→If a chemical equation has 2 oxygen atoms on the reactant side and 1 oxygen atom on the product side, what is the equation?
Class 10 · Science · Medium
→In which type of reaction do the ions of two compounds exchange with each other?
Class 10 · Science · Medium
→Which method most effectively reduces rancidity in foods containing oils and fats?
Class 10 · Science · Medium
→In which condition is an iron object most likely to rust?
Class 10 · Science · Medium
→What is the main difference between displacement and double displacement reactions?
Class 10 · Science · Medium
→What is the correct reason for rubbing and cleaning a magnesium ribbon before burning it?
Class 10 · Science · Medium
→Which of the following statements about a balanced chemical equation is incorrect?
Class 10 · Science · Medium
→If gas evolves in a reaction but the colour does not change, what is the correct conclusion?
Class 10 · Science · Medium
→A student says that every colour change is a chemical reaction. What is the correct conclusion?
Class 10 · Science · Medium
→Which of the following reactions is an example of thermal decomposition?
Class 10 · Science · Medium
→Which of the following reactions is an example of electrolytic decomposition?
Class 10 · Science · Medium
→Which of the following reactions is an example of photolytic decomposition?
Class 10 · Science · Medium
→Which of the following reactions is an example of a double displacement reaction?
Class 10 · Science · Medium
→Why is photosynthesis considered a chemical reaction?
Class 10 · Science · Medium
→If the reaction vessel becomes hot during a chemical reaction, which type of reaction does this indicate?
Class 10 · Science · Medium
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