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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

How are substances identified in a chemical reaction?On which side of a chemical equation are the new substances formed in a reaction written?On which side of a chemical equation are the starting substances that take part in a reaction written?What does the arrow in a chemical equation show?The production of light during a change can indicate what?Why does a magnesium ribbon emit a dazzling white light when it burns?When magnesium oxide is added to water, what is the nature of the resulting aqueous mixture?Which product is formed when calcium oxide reacts with water?What is a chemical equation written before balancing called?What must not be changed while balancing a chemical equation?According to the law of conservation of mass, which quantity remains the same before and after a chemical reaction?When two substances combine to form one substance which reaction is identified?When a single compound breaks down to form two or more simpler substances, what type of reaction is it called?Which is a correct example of a decomposition reaction caused by heating?In an electrolytic decomposition reaction, in which form is energy supplied to decompose a compound?In a photolytic decomposition reaction, what supplies the energy needed to decompose a compound?Which metal is produced when silver chloride decomposes in sunlight?In a metal displacement reaction, which metal displaces another metal from its compound or salt solution?When an iron nail is placed in copper sulphate solution, what is the reddish-brown coating formed on the nail?When an iron nail is placed in copper sulphate solution, the pale green solution formed mainly contains which substance?