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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

What is the process called when one or more substances form new substances with different properties?Which of the following observations can be a common sign that a chemical reaction has occurred?What are the substances written on the left side of the arrow in a chemical equation called?What are the substances written on the right side of the arrow in a chemical equation called?Balancing a chemical equation is based on which law?What must be the same on the reactant and product sides of a balanced chemical equation?When two or more reactants combine to form a single product, what type of reaction is it?Calcium oxide reacts with water to form calcium hydroxide. What type of reaction is this?When a compound breaks down into two or more simpler substances, what type of reaction is it?When calcium carbonate is heated, it forms calcium oxide and carbon dioxide. What type of reaction is this?What is a decomposition reaction caused by heating called?The decomposition of water into hydrogen and oxygen when electric current is passed through it is which type of reaction?Why does silver chloride change colour in the presence of light?What colour does silver chloride become when kept in sunlight?What is the reaction called when a more reactive metal displaces a less reactive metal from its compound?When an iron nail is placed in copper sulphate solution, which metal is deposited on the surface of the nail?Which of the following reactions is an example of an exothermic reaction?When two ionic compounds exchange cations and anions to form two new compounds, what type of reaction is it called?What is the insoluble solid formed during a chemical reaction in a solution called?Which white precipitate is formed when aqueous solutions of barium chloride and sodium sulphate are mixed?