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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

At which electrode is the gas with greater volume obtained during electrolysis of water?What is the main purpose of adding a little acid during electrolysis of water?On what basis is the difference between thermal decomposition and electrolytic decomposition most clearly identified?What causes the green solution when an iron nail is placed in copper sulphate solution?Fading of the blue colour of copper sulphate is related to which ionic change?Which products are formed when barium chloride and sodium sulphate solutions are mixed?Formation of white insoluble barium sulphate proves which dual identification?Why is a precipitate shown with a downward arrow?In the reaction of copper oxide and hydrogen a black substance becomes reddish brown. What does it correctly mean?Why is hydrogen called oxidised in the reaction between copper oxide and hydrogen?If substance A loses oxygen and substance B loses hydrogen which processes occur respectively?Why do oxidation and reduction occur together in a redox reaction?Why are both oxygen and moisture considered necessary for rusting of iron?Why can rusting start when the paint layer on iron gets scratched?How does the zinc layer protect iron in galvanisation?What is the chemical reason why an oiled iron object rusts less?Rancidity of oils and fats is the result of which chemical process?Which of the following reactions is both a displacement reaction and an oxidation-reduction reaction?Why is rancidity slower in nitrogen-filled food packets?Which process do antioxidants slow down in food?