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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 of the following equations represents an exothermic reaction?Which symbol shows the liquid state in a chemical equation?Which symbol shows the gaseous state in a chemical equation?Which symbol represents an aqueous solution in a chemical equation?What does an upward arrow  written with a product in a chemical equation indicate?What does a downward arrow show in a chemical equation?Why is digestion of food considered a chemical change?A student wrote \(Mg + O_2 \rightarrow MgO\) for the burning of magnesium in oxygen and claimed that it is balanced. Which is the correct balanced equation?Which observation provides the best evidence that a chemical reaction has occurred in an experiment?Which is the balanced chemical equation for the reaction in which hydrogen and oxygen form water?Which is the correct match for the white powder formed when a magnesium ribbon burns in air and the type of reaction?When water is added to calcium oxide, the container becomes hot. What does this indicate about the reaction?When lead nitrate is heated, brown fumes are evolved. Which gas causes these fumes, and what type of reaction is this?Silver chloride turns grey when kept in sunlight. What is the correct reason?What is the ratio of the volumes of hydrogen and oxygen gases collected during the electrolysis of water?Why does the blue colour of copper sulphate solution fade and turn green when an iron nail is added?When a zinc strip is placed in copper sulphate solution, which statement is correct?While heating lead nitrate, a student identified the evolved brown gas as oxygen. What is the correct correction to the student's statement?When an aqueous solution of barium chloride is mixed with an aqueous solution of sodium sulphate, a white precipitate is formed. What type of reaction is this?When copper oxide is heated with hydrogen, copper is formed. Which process occurs to copper oxide in this reaction?