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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 substance is reduced in the reaction between copper(II) oxide and hydrogen?When oxygen is removed from one substance and, in the same reaction, added to another substance, what is the reaction called?What is the process called in which hydrogen is added to a substance or oxygen is removed from it?What is a reaction called in which hydrogen is removed from a substance or oxygen is added to it?Why is rusting of iron considered an example of slow oxidation?One iron nail is kept in a dry, airtight bottle and another nail is kept in moist open air. Which nail will rust faster?What type of reaction is \(\mathrm{Fe + CuSO_4 \rightarrow FeSO_4 + Cu}\), and why?Why does rancidity occur faster when oily food is kept in warm, open air?Filling chips packets with nitrogen gas reduces which chemical problem?How do antioxidants help keep foods containing oils and fats fit for consumption for a longer time?If the container becomes cold and a gas also evolves in a reaction, what is the most careful conclusion?If heat is written on the product side of a chemical equation, what does it mean?If heat is written with the reactants in a reaction, what is the correct meaning?What is the similarity between combustion and respiration?What is the correct reason for considering photosynthesis an energy-absorbing process?In which of the following examples is no new substance formed and only a change of state occurs?Why is conversion of milk into curd considered a chemical change in advanced questions?Which of the following reactions shows a more reactive metal displacing a less reactive metal from its aqueous salt solution?Which of the following chemical equation represents a double displacement reaction in which a precipitate is formed?Which statement gives the clearest identification of a chemical reaction?