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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

Which product is formed when water is added to calcium oxide?On what basis is the reaction of calcium oxide and water called an exothermic combination reaction?Which solid and gas are formed when calcium carbonate is heated?When the gas evolved during thermal decomposition of calcium carbonate is passed through lime water, it turns milky. Which gas does this confirm?Which pair correctly identifies the brown gas and the colourless gas produced when lead nitrate is heated?Which yellow solid residue is formed on thermal decomposition of lead nitrate?Which gas is identified by brown fumes in the decomposition of lead nitrate?When silver chloride is exposed to light, its colour changes from white to grey. This is an example of which type of decomposition reaction?Which product is mainly responsible for silver chloride turning grey on exposure to light?What is the most correct reason for keeping silver salts in dark-coloured bottles?In the electrolysis of water, if the volume of oxygen produced is 15 mL, what will be the volume of hydrogen produced under the same conditions?In which of the following reactions does an element in the same substance undergo both oxidation and reduction simultaneously?At which electrode is the gas with lower volume formed during electrolysis of water?What mainly increases when a small amount of acid is added during the electrolysis of water?On what basis is the main difference between electrolytic decomposition and photolytic decomposition identified?Why does a green solution form when an iron nail is placed in copper sulphate solution?Fading of blue colour of copper sulphate solution is linked with decrease of which ion?Metal A is less reactive than metal B. What will happen when metal A is placed in the salt solution of metal B?A student says that carbon dioxide extinguishes fire, so pouring CO₂ over a burning magnesium ribbon will put it out. Why is this statement incorrect?Formation of white solid barium sulphate shows which dual identification?