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Subjects

Science

Chemical Reactions and Equations

रासायनिक अभिक्रियाएँ और समीकरण

In Class 10 Science, under the chapter Chemical Substances – Nature and Behaviour, this topic introduces chemical reactions as changes that form new substances. Students learn to identify reactants and products, represent reactions through word and chemical equations, and write balanced equations using correct chemical formulae while following the law of conservation of mass.

Practice questions

Why is photosynthesis considered a chemical reaction?Which of the following reactions is an example of a double displacement reaction?Which of the following reactions is an example of photolytic decomposition?Which of the following reactions is an example of electrolytic decomposition?Which of the following reactions is an example of thermal decomposition?A student says that every colour change is a chemical reaction. What is the correct conclusion?If gas evolves in a reaction but the colour does not change, what is the correct conclusion?Which of the following statements about a balanced chemical equation is incorrect?What is the correct reason for rubbing and cleaning a magnesium ribbon before burning it?What is the main difference between displacement and double displacement reactions?In which condition is an iron object most likely to rust?Which method most effectively reduces rancidity in foods containing oils and fats?In which type of reaction do the ions of two compounds exchange with each other?If a chemical equation has 2 oxygen atoms on the reactant side and 1 oxygen atom on the product side, what is the equation?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?Which statement correctly explains the relation between oxidation and reduction?When water is added to a coloured solution, its colour becomes lighter, but no new substance is formed. What does this change represent?In which type of decomposition reaction does light energy help break down a compound?In an experiment, bubbles formed and the container became cold. Which is the most cautious conclusion based on these observations?When the reaction of magnesium burning in oxygen is balanced, what coefficient is placed before magnesium oxide?