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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 main reason for filling potato-chip packets with nitrogen gas?Which process do antioxidants slow down?What does a downward arrow in a chemical equation indicate?What does an upward arrow ( \uparrow ) after a product in a chemical equation indicate?Which state symbol represents a substance in the solid state in a chemical equation?Which is the symbol for liquid state in a chemical equation?Which symbol represents the gaseous state in a chemical equation?Which symbol denotes the state of a substance dissolved in water in a chemical equation?Why is it wrong to change chemical formulae while balancing a chemical equation?What is equal on both sides of a balanced chemical equation?What does the law of conservation of mass state?What must be written for the reactants and products to convert a word equation into a chemical equation?What is necessary to convert a skeletal chemical equation into a complete chemical equation?In a combustion reaction, energy is generally released in which form?If temperature decreases in a reaction what type can it be?If the temperature of a reaction mixture rises without external heating, what type of reaction does this indicate?Which of the following changes is an indication of a chemical reaction?A student places a clean iron nail in a blue copper sulphate solution for 20 minutes. Which observation correctly confirms that a displacement reaction has occurred?Why is it not correct to depend on only one sign while identifying a reaction?In a balanced chemical equation, how does the number of atoms of each element compare in the reactants and products?