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Class 10 · Science
→In the thermite reaction Fe₂O₃ + 2Al → Al₂O₃ + 2Fe, which statement correctly identifies oxidation and reduction?
Class 10 · Science
→Why are oxidation and reduction considered together in a redox reaction?
Class 10 · Science
→What type of reaction is represented by \(2Pb(NO_3)_2 \xrightarrow{\Delta} 2PbO + 4NO_2 + O_2\)?
Class 10 · Science
→In the thermite reaction \(Fe_2O_3 + 2Al \rightarrow Al_2O_3 + 2Fe\), which substance is oxidised and which is reduced?
Class 10 · Science
→When black copper(II) oxide, \(\mathrm{CuO}\), is heated with hydrogen gas, reddish-brown copper is formed. This change is an example of what?
Class 10 · Science
→Why is a precipitate shown by a downward arrow in an equation?
Class 10 · Science
→In the reaction \(Fe_2O_3 + 2Al \rightarrow Al_2O_3 + 2Fe\), which substance acts as the reducing agent?
Class 10 · Science
→What is the correct set of products when barium chloride and sodium sulphate solutions are mixed?
Class 10 · Science
→Metal A is less reactive than metal B. What will happen if metal A is placed in an aqueous solution of a salt of metal B?
Class 10 · Science
→If metal A displaces metal B from an aqueous solution of its salt, but metal B does not displace metal A from a solution of its salt, which metal is more reactive?
Class 10 · Science
→When an iron nail is immersed in a blue copper sulphate solution, the blue colour fades. This is mainly due to which ionic change?
Class 10 · Science
→Why does copper deposit on the surface of an iron nail placed in copper sulphate solution?
Class 10 · Science
→Why can the solution turn green when an iron nail is placed in copper sulphate solution?
Class 10 · Science
→What is the main purpose of adding dilute sulfuric acid during the electrolysis of water?
Class 10 · Science
→A student places a clean iron nail in a blue copper sulphate solution. Which observation most clearly shows that a displacement reaction has occurred?
Class 10 · Science
→What is the correct order of gases produced at the anode and cathode during the electrolysis of water?
Class 10 · Science
→During electrolysis of water, if the volume of oxygen produced is 12 mL at the same temperature and pressure, what volume of hydrogen is produced?
Class 10 · Science
→Why are light-sensitive silver salts, such as silver chloride, stored in dark-coloured bottles?
Class 10 · Science
→When white silver chloride g( gCl) is exposed to sunlight, it turns grey. Which product is responsible for this colour change?
Class 10 · Science
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