In a galvanic (voltaic) cell, chemical energy converts to electrical energy. Oxidation occurs at the anode, which is the negative electrode (electrons leave from it). Reduction occurs at the cathode, which is positive. This is opposite to electrolytic cell where anode is positive. Daniell cell: Zn anode (-), Cu cathode (+).
Explanation:
Reverse osmosis uses a semipermeable membrane to reject dissolved salts and impurities. Filtration removes solids; chlorination/ozonation disinfect but do not remove salts.
Explanation:
Hydrogen peroxide is a strong oxidizing agent. In dilute solutions (3-6%), it is used as a mild antiseptic for minor cuts and as a bleaching agent for hair, teeth, and delicate materials like silk and wool. It decomposes into water and oxygen.
Explanation:
Silver (Ag) is a noble metal below hydrogen in the reactivity series and does not displace H₂ from dilute acids. Mg, Al, Fe are above H and react: Mg + 2HCl → MgCl₂ + H₂. However, Al reacts slowly initially due to oxide layer. Copper also doesn't react. The reactivity series determines acid reactivity.
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