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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

In the reaction CuO + H₂ → Cu + H₂O, which process occurs to hydrogen?What is a reaction called in which one substance gains oxygen and another substance loses oxygen?What role do air and moisture play in the rusting of iron?A white sample of silver chloride turns grey when kept in sunlight. Which equation correctly represents this change?What is the scientific reason for filling potato chips packets with nitrogen gas?Why are antioxidants added to food materials to prevent rancidity?Which of the following changes is the best example of a chemical change?What is the correct difference between melting of ice and burning of a candle?Which observation is the most suitable indicator of a precipitation reaction?If a chemical reaction produces two or more products from a single reactant, what type of reaction is it?When two or more reactants combine to form a single product, which type of reaction is it?Why is a combustion reaction generally considered exothermic?On what basis can respiration be related to combustion?Why are coefficients changed instead of chemical formulae while balancing equations?According to the law of conservation of mass, how should the number of atoms of each element compare on the reactant and product sides of a balanced chemical equation?What is the correct meaning of upward and downward arrows in a chemical equation?When is the aqueous state symbol (aq) used in a chemical equation?Which of the following observations is not evidence that a chemical reaction has occurred?If the temperature of a reaction mixture decreases during a reaction, it generally indicates which type of reaction?If the reaction vessel becomes hot during a chemical reaction, which type of reaction does this indicate?