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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 are light-sensitive silver salts, such as silver chloride, stored in dark-coloured bottles?During electrolysis of water, if the volume of oxygen produced is 12 mL at the same temperature and pressure, what volume of hydrogen is produced?What is the correct order of gases produced at the anode and cathode during the electrolysis of water?A student places a clean iron nail in a blue copper sulphate solution. Which observation most clearly shows that a displacement reaction has occurred?What is the main purpose of adding dilute sulfuric acid during the electrolysis of water?Why can the solution turn green when an iron nail is placed in copper sulphate solution?Why does copper deposit on the surface of an iron nail placed in copper sulphate solution?When an iron nail is immersed in a blue copper sulphate solution, the blue colour fades. This is mainly due to which ionic change?If metal A displaces metal B from an aqueous solution of its salt, but metal B does not displace metal A from a solution of its salt, which metal is more reactive?What is the correct set of products when barium chloride and sodium sulphate solutions are mixed?In the reaction \(Fe_2O_3 + 2Al \rightarrow Al_2O_3 + 2Fe\), which substance acts as the reducing agent?Why is a precipitate shown by a downward arrow in an equation?When black copper(II) oxide, \(\mathrm{CuO}\), is heated with hydrogen gas, reddish-brown copper is formed. This change is an example of what?In the thermite reaction \(Fe_2O_3 + 2Al \rightarrow Al_2O_3 + 2Fe\), which substance is oxidised and which is reduced?What type of reaction is represented by \(2Pb(NO_3)_2 \xrightarrow{\Delta} 2PbO + 4NO_2 + O_2\)?Why are oxidation and reduction considered together in a redox reaction?In the thermite reaction Fe₂O₃ + 2Al → Al₂O₃ + 2Fe, which statement correctly identifies oxidation and reduction?Which of the following is a redox reaction in which the oxidation number of one element increases and that of another element decreases?In galvanisation, the zinc coating mainly prevents iron from coming into contact with which of the following?Why does an oiled iron object rust less?