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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 which of the following mixtures will a metal displacement reaction not occur?Which observation indicates that a reaction occurs when aqueous barium chloride and sodium sulphate solutions are mixed?Which products are formed when calcium carbonate is heated?When lead nitrate is heated, brown nitrogen dioxide gas is formed. What type of reaction is this?Why is the volume of hydrogen gas greater than the volume of oxygen gas during electrolysis of water?Why is silver chloride protected from light?Which statement is correct about the reaction CuO + H₂ → Cu + H₂O between copper(II) oxide and hydrogen?In which reaction must heat energy be supplied for the reaction to occur?If heat is written on the product side of an equation, what type of reaction is it?If heat is written on the reactant side of an equation, what type of reaction is it?What is the scientific reason for cleaning a magnesium ribbon before burning it?Which statement correctly describes a combination reaction?Which statement best describes a decomposition reaction?A student said that electrolysis of water is a combination reaction. Why is this statement incorrect?In a double displacement reaction, between which substances does the exchange of ions occur?In which reaction do both double displacement and precipitation occur?When an aqueous solution of barium chloride is mixed with an aqueous solution of sodium sulphate, which white precipitate is formed?In which situation is a substance considered to be oxidised?In which situation is a substance considered to be reduced?How is a redox reaction identified?