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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

Why does no reaction occur when a copper strip is placed in zinc sulphate solution?When an iron nail is placed in copper sulphate solution, the solution changes colour and copper is deposited. What type of chemical reaction is this?What is the main characteristic of a double displacement reaction?An iron nail was kept in a blue copper sulfate solution for some time. The solution turned light green and a reddish-brown coating appeared on the nail. Which is the correct explanation of this change?What happens to hydrogen in the reaction between copper oxide and hydrogen?Which two processes occur simultaneously in a redox reaction?Which process generally occurs when oxygen is added to a substance?Which process generally occurs when oxygen is removed from a substance?If hydrogen is added to a substance, it is generally related to which process?Removal of hydrogen from a substance generally indicates which process?Rusting of iron is an example of which process?Why does painting iron reduce rusting?Which of the following equations represents a displacement reaction?A student calls the reaction \(Fe + CuSO_4 \rightarrow FeSO_4 + Cu\) a double displacement reaction. What is the correct correction to the statement?What is the main scientific reason for filling chips packets with nitrogen gas?How do antioxidants help preserve food materials?Why does keeping food in an airtight container reduce rancidity?Why is melting of ice not a chemical change?Why is the conversion of milk into curd considered a chemical change?Why is respiration called an exothermic reaction?