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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 volume ratio of hydrogen to oxygen gases produced during the electrolysis of water?Which pair of products is formed when an iron nail is placed in copper sulphate solution?Which substance is displaced when an iron nail is placed in copper sulphate solution?If, under the same suitable conditions, metal A cannot displace metal B from an aqueous solution of its salt, what is the most appropriate conclusion?When an aqueous solution of barium chloride is mixed with an aqueous solution of sodium sulphate, what visible change is observed?How are the products identified in a double displacement reaction?When is using a downward arrow appropriate in a precipitation reaction?How is water formed in the reaction between copper oxide and hydrogen?When copper oxide is converted into copper, which process takes place?When lead nitrate is heated, a brown gas is evolved. Which equation correctly represents this thermal decomposition?Which of the following chemical equations represents a combination reaction?Which statement about oxidation and reduction in a redox reaction is correct?What type of chemical change is rusting of iron?How does applying oil to iron reduce rusting?In galvanisation, the zinc coating on iron mainly protects it from what?Which chemical process mainly causes oils and fats to become rancid?Why does storing food in airtight containers reduce rancidity?What is the main purpose of filling nitrogen gas in food packets?In which example does only a change of state occur and no new substance form?Why is the conversion of milk into curd a chemical change?