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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 is the burning of magnesium considered a combination reaction?Calcium oxide reacts with water to form only calcium hydroxide, and the container becomes hot. Which conclusion is most complete?Which is the correct pair of solid and gaseous products formed when calcium carbonate is heated?What type of chemical reaction is \(2AgCl \xrightarrow{\text{sunlight}} 2Ag + Cl_2\), which occurs in the presence of sunlight?When lead nitrate is heated, it decomposes to form lead oxide, nitrogen dioxide, and oxygen. Which gas is brown in colour?Which colourless gas is evolved during the thermal decomposition of lead nitrate?What type of reaction occurs when lead nitrate decomposes on heating?The white colour of silver chloride turning grey in light is evidence of what?Why are photosensitive silver salts such as silver chloride kept in the dark?During the electrolysis of water, if the volume of hydrogen collected is 18 mL at the same temperature and pressure, what is the expected volume of oxygen?Why is the volume of gas collected at the anode lower during electrolysis of acidified water?Why does electric current pass more easily when a small amount of dilute acid is added during the electrolysis of water?What is the main difference between electrolytic decomposition and thermal decomposition?When an iron nail is placed in copper sulphate solution, a reddish-brown coating forms on the nail and the solution turns green. What is the correct reason?Which reaction is an example of a double displacement reaction in which a precipitate is formed?Metal A displaces metal B from its salt, and metal B does not displace metal A. What is the correct conclusion?A student wrote \(\mathrm{Fe + H_2O \rightarrow FeO + H_2}\) for the reaction of iron with steam. What is the main error in this equation?Which of the following reactions involves oxidation of one substance and reduction of another substance simultaneously?In the reaction \(\mathrm{CuO + H_2 \rightarrow Cu + H_2O}\), which substance is reduced?Which symbol is used in a chemical equation to show the formation of an insoluble solid in a precipitation reaction?