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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

Under which condition will rancidity in oily food increase the fastest?Which of the following methods does not help protect iron from rusting?In which reaction is heat energy supplied as a necessary condition for the reaction rather than released as a product?If heat is written on the product side of a chemical equation, what type of reaction is it?If heat is written on the reactant side of a chemical equation, what type of reaction is it?In which example are both gas evolution and a colour change observed as signs of a chemical reaction?In which experiment does the volume ratio of the gases obtained indicate the composition of water?Which of the following involves only a physical change?In an unknown reaction, the colour changes, heat is released, and a gas forms. What is the most suitable conclusion?Before balancing a chemical equation, what should be checked first?Why must subscripts in chemical formulae not be changed while balancing a chemical equation?In the balanced chemical equation for burning magnesium, \(2\mathrm{Mg}+\mathrm{O}_2\rightarrow2\mathrm{MgO}\), how many magnesium atoms are on the reactant side?In the balanced chemical equation for the formation of water from hydrogen and oxygen, how many water molecules are on the product side?Which energy change occurs when calcium oxide reacts with water to form calcium hydroxide?Why is the reaction between calcium oxide and water that forms calcium hydroxide called a combination reaction?What is the identity of the brown gas formed on heating lead nitrate?On thermal decomposition of lead nitrate, which solid product is formed besides gases?What is the main reason that white silver chloride turns grey during its photolytic decomposition?Why are silver salts such as silver chloride and silver bromide mainly used in photography?Which gas is produced at the anode during the electrolysis of acidified water?