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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 role of substances written on the left side of a chemical equation?What is the role of substances written on the right side of a chemical equation?Why is a chemical equation more useful than a word equation?Where are coefficients placed while balancing a chemical equation?Why is balancing an equation by changing chemical formulae wrong?What is a reaction called in which two substances combine to form one product?What is the reaction called in which a compound breaks down into two or more simpler substances?Which gas is produced when calcium carbonate is heated?When an iron nail is kept in a blue copper sulphate solution for some time, the solution fades and a reddish-brown coating forms on the nail. Which type of reaction does this represent?When calcium oxide is mixed with water, heat is released. Based on the heat change, what type of reaction is this?When a magnesium ribbon burns, the reaction is \(2Mg + O_2 \rightarrow 2MgO\). Which statement about this reaction is correct?What type of decomposition reaction occurs when lead nitrate, eq ext{Pb(NO}_3 ext{)}_2 , is heated?Why does silver chloride turn from white to grey when kept in sunlight?The photolytic decomposition of silver chloride and silver bromide is used in which application?Which gas is obtained in a greater volume during the electrolysis of water?A student places a clean iron nail in a blue copper sulphate solution. Which observation after some time confirms that a displacement reaction has occurred?Which type of reaction occurs when an iron nail is placed in copper sulphate solution?When an iron nail is placed in copper sulphate solution, the colour of the solution changes from blue to which colour?When a zinc strip is placed in copper sulphate solution, which metal is deposited as a coating on the zinc surface?Why can copper not displace zinc from zinc sulphate solution?