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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 can a change in smell show in a chemical reaction?Why is a coat of paint applied to iron to prevent rusting?What is the method of preventing rust by coating iron with zinc called?Rusting of iron is closely related to which process?Rancidity is mainly caused by what?Why is food kept in airtight containers to reduce rancidity?Filling potato chips packets with nitrogen gas reduces which problem?Which symbol represents the state of a substance dissolved in water in a chemical equation?Which state symbol is used to represent a solid substance in a chemical equation?Which symbol represents the liquid state of a substance in a chemical equation?What does an upward arrow indicate in a chemical reaction?What does a downward arrow (↓) indicate in a chemical equation?What is the main limitation of a skeletal chemical equation?What is the first step in converting a word equation into a chemical equation?What should be changed while balancing a chemical equation?According to the law of conservation of mass, what happens to the total mass during a chemical reaction in a closed system?What can increase in temperature indicate in a chemical reaction?What does a decrease in the temperature of the reaction mixture generally indicate during a chemical reaction?If a colourless gas is evolved in a chemical reaction, is it correct to conclude that no reaction occurred solely because no colour change is seen?Which is the most appropriate indication that a chemical reaction has occurred in the laboratory?