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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

If heat is written on the products side of a chemical equation, what type of reaction does it represent?If heat is absorbed along with the reactants in a reaction and one compound breaks down to form two or more products, what type of reaction is it?Why are combustion and respiration placed in the same category on the basis of energy change?What is the main energy based difference between photosynthesis and respiration?What is the difference between the mechanical chewing of food and its chemical digestion?Which of the following equations represents a double displacement reaction in which an insoluble precipitate is formed?In the reaction \(\mathrm{CuO + H_2 \rightarrow Cu + H_2O}\), which correctly identifies the oxidation and reduction?In which of the following reactions does the same substance undergo both oxidation and reduction?What is the correct difference between downward arrow and upward arrow?Which correctly identifies the oxidation and reduction changes in the reaction CuO + H₂ → Cu + H₂O?In which of the following reactions does the same element undergo both oxidation and reduction?When a clean iron nail is dipped in a blue copper sulphate solution, which observation confirms that a displacement reaction has occurred?Which of the following reaction is both a displacement reaction and a redox reaction?Which of the following reaction is an example of both a displacement reaction and a redox reaction?In an unknown process, a substance with new properties was formed, and the total mass in a closed container was the same before and after the process. What is the most appropriate conclusion?Limestone, \(\mathrm{CaCO_3}\), is heated in a sealed container and decomposes into calcium oxide and carbon dioxide. If the carbon dioxide does not escape, what is the correct conclusion about the total mass of substances before and after the reaction?What happens if the subscripts in the chemical formula of a compound are changed while balancing a chemical equation?If the product side of a balanced chemical equation contains two water molecules, \(2\mathrm{H_2O}\), what total number of hydrogen atoms must be present on the reactant side?In the reaction of magnesium with oxygen, if 2 formula units of magnesium oxide are formed, how many \(\mathrm{O_2}\) molecules are needed to balance the equation?When a single compound breaks down into two or more simpler substances on heating, what type of reaction is it?