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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 does rancidity increase when oily food is kept in open air?What effect do airtight packaging and filling a packet with nitrogen gas have on rancidity?What is the importance of temperature change in identifying a chemical reaction?During a chemical reaction, gas evolves and the container feels warm without external heating. What is the most appropriate conclusion?Which statement correctly distinguishes exothermic and endothermic reactions?What type of change occurs when glucose is formed from carbon dioxide and water during photosynthesis?Why is the breakdown of glucose during aerobic respiration a chemical reaction?What is the similarity between digestion of food and formation of curd from milk?How does melting of ice differ from electrolysis of water?In which example does a colour change occur along with the formation of new substances?When two aqueous solutions are mixed and an insoluble solid forms, what is the most appropriate conclusion?What do state symbols such as \((s)\), \((l)\), \((g)\), and \((aq)\) indicate in a chemical equation?If an upward arrow (↑) is written next to a product in a chemical equation, what does it indicate?If a downward arrow (↓) is shown next to a product in a chemical equation, what does it indicate?Which statement correctly explains the law of conservation of mass?If the number of atoms of an element is not the same on the reactant and product sides of a chemical equation, what is the equation called?What is the most important care while converting a word equation into a chemical equation?While balancing a chemical equation, what must not be changed?Which statement about a displacement reaction is correct?When the ions of two ionic compounds exchange partners to form two new compounds, what is this reaction called?