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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

Which two gases are produced during the electrolysis of water?An iron grill is kept for one week under different conditions. Under which condition is it most likely to rust?When an iron nail is placed in a blue copper sulphate solution, which substance is formed in the solution?What coloured coating forms on an iron nail when it is placed in copper sulphate solution?Which property of a metal is needed for a displacement reaction?Which of the following reactions is an example of a combination reaction?When two aqueous solutions are mixed and a white insoluble solid forms, what type of reaction is this?Which precipitate is formed when aqueous barium chloride reacts with aqueous sodium sulphate?What is exchanged in a double displacement reaction?Which products are formed when copper(II) oxide is heated with hydrogen gas?When oxygen is removed from copper(II) oxide, which process does copper(II) oxide undergo?In the reaction between heated copper(II) oxide and hydrogen, what does hydrogen change into?What is a substance called when oxygen is added to it?A substance from which oxygen is removed undergoes which process?A student says that magnesium is not oxidised in the reaction 2Mg + O₂ → 2MgO because it merely combines with oxygen to form a compound. What is the error in this statement?Rusting of iron is related to which process?What is the main purpose of painting iron to prevent rusting?In galvanisation, iron is coated with a layer of which metal?What is the development of an unpleasant smell and taste in oils and fats due to oxidation called?What is reduced when food is kept in a cool place to prevent rancidity?