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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 does a displacement reaction not occur when a copper strip is placed in zinc sulphate solution?Which substance is deposited on the surface of zinc when it is placed in copper sulphate solution?Why does the blue colour of copper sulphate solution fade when zinc is added?Which gas causes the brown fumes when lead nitrate is heated?What type of reaction occurs when lead nitrate is heated?Why does copper powder turn black when heated in air?What is the process called when copper is formed by passing hydrogen gas over copper(II) oxide?What happens to hydrogen in the reaction between copper(II) oxide and hydrogen?In which type of reaction is the formation of an insoluble solid on mixing two aqueous solutions a main sign?What type of reaction occurs when aqueous solutions of sodium sulphate and barium chloride are mixed?In a balanced chemical equation, how does the number of oxygen atoms compare on the reactant and product sides?Digestion of food is considered which type of change?When a candle is lit, what type of change mainly occurs in the combustion of wax vapour?Cooking of rice is which type of change?Why is melting of ice not a chemical reaction?What is the nature of the white powder formed when magnesium burns?A large amount of heat is released when water is added to calcium oxide. What type of reaction is this?Decomposition reactions in which energy must be supplied are generally of which type?Which gas is generally necessary for a combustion reaction in air?If bubbles are observed during a chemical reaction, what do they usually indicate?