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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 rusting of iron called slow oxidation?Which method most directly prevents iron from coming into contact with air and moisture, thereby protecting it from rusting?Which metal is coated on iron during galvanisation to protect it from rusting?What is the main chemical cause of the bad taste and smell in oils and fats?What is the benefit of filling nitrogen to prevent rancidity?An iron object is coated with zinc to prevent rusting. What is the main reason for this method?Under which condition is rancidity most likely to increase fastest in oily food?What is the main difference between a chemical change and a physical change?On what basis is conversion of milk into curd a chemical change?When an iron nail is kept in a blue copper sulphate solution for some time, the solution turns light green and a reddish-brown coating forms on the nail. What type of reaction is this?Why is respiration considered a chemical reaction?What is the role of light energy in photosynthesis?How does a balanced chemical equation demonstrate the law of conservation of mass?Why should subscripts in chemical formulae not be changed while balancing a chemical equation?What is done to convert a skeletal chemical equation into a balanced chemical equation?Which observation shows that a chemical reaction is exothermic?Which observation indicates that a reaction is endothermic?If bubbles form in an experiment, which conclusion is most careful?If a substance appears to change colour but no other clear sign of a chemical change is observed, what should be done?What is the correct meaning of the state symbol (aq) in a chemical equation?