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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

In the balanced reaction for burning magnesium, if one molecule of oxygen ( ext{O}_2 ) is used, how many magnesium atoms are required?In which situation will a chemical equation not be considered balanced?What problem occurs if subscripts are changed while balancing an equation?In a reaction, two reactants combine to form only one product, and the container becomes hot. What is the most appropriate classification of the reaction?Which statement best describes the reaction of calcium oxide with water?Which is the correct set of products formed when calcium carbonate is heated?Which pair correctly identifies the brown gas and the solid residue formed on heating lead nitrate?What is the role of heat in the reaction of heating lead nitrate?Why is the volume of hydrogen collected at the cathode approximately twice the volume of oxygen collected at the anode during electrolysis of water?A student placed an iron nail in a blue copper sulphate solution. After some time, the solution turned light green and a reddish-brown coating appeared on the nail. Which type of reaction does this illustrate?Silver chloride turns grey in sunlight. Which substance is mainly responsible for this colour change?What is the main reason for storing silver chloride in a dark-coloured bottle?Which of the following equations represents a decomposition reaction that occurs in the presence of light?Which new salt is formed when an iron nail is placed in copper sulphate solution?If a copper strip is placed in an aqueous zinc sulphate solution and no visible change occurs, what is the correct reason?Why does a precipitate form when aqueous solutions of barium chloride and sodium sulphate are mixed?Which of the following equations represents a double displacement reaction?Which of the following reactions is both a double displacement reaction and a precipitation reaction?When copper(II) oxide is heated with hydrogen gas, the black substance changes into a reddish-brown substance. What is the reddish-brown substance?Which substance is oxidised in the reaction between copper(II) oxide and hydrogen?