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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

When water is added to calcium oxide, calcium hydroxide is formed and heat is released. What type of reaction is this?In the reaction \(CuO + H_2 \rightarrow Cu + H_2O\), which statement about oxidation and reduction is correct?When lead nitrate is heated, a solid residue and a brown gas are formed. Which pair is correct?Why is it incorrect to identify the brown fumes evolved on heating lead nitrate as oxygen?When silver chloride is exposed to sunlight, it turns grey. What is the main reason for this colour change?What is the scientific reason for storing silver bromide in a dark-coloured bottle?During electrolysis of water, at the same temperature and pressure, if the volume of oxygen collected is 7 mL, what volume of hydrogen will be collected?Which correctly identifies oxidation and reduction in the following reaction? \(\mathrm{Zn + CuSO_4 \rightarrow ZnSO_4 + Cu}\)Which problem is solved by adding a small amount of acid during electrolysis of water?When an iron nail is placed in copper sulphate solution, which substance is deposited on the surface of the nail?In the thermite reaction \(Fe_2O_3 + 2Al \rightarrow Al_2O_3 + 2Fe\), which substance acts as the reducing agent?Zinc displaces copper from an aqueous solution of its salt, but copper does not displace zinc from an aqueous solution of its salt. What is the most correct conclusion?When two aqueous solutions are mixed, white insoluble barium sulphate and sodium chloride are formed. Which pair of original solutions could have been used?Why does a precipitate form when aqueous barium chloride reacts with aqueous sodium sulphate?How are products predicted in a double displacement reaction?A student heated 12.0 g of calcium carbonate in an open crucible and obtained 6.7 g of solid. Which evaluation is correct?When copper(II) oxide is heated with hydrogen gas, what change occurs in the copper(II) oxide?In the reaction between copper(II) oxide and hydrogen, the formation of water indicates the oxidation of which substance?Which of the following is a double displacement reaction that forms a precipitate?When aqueous barium chloride and sodium sulfate are mixed, which pair of ions combines to form the white precipitate?