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The document discusses electrolysis experiments using two electrodes, P and Q. At electrode P/cathode, sodium and hydrogen ions are attracted due to their position in the electrochemical series. At electrode Q/anode, chloride and hydroxide ions are attracted due to their higher concentration, and chloride ions are selectively discharged. The explanation involves experiments comparing the reactivity of metals like silver, L, and M based on their positions in the electrochemical series.
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- 1. Answers (a) • at electrode P/ cathode , the position of ions in electrochemical series. • at electrode Q / anode , concentration of ions.
- 2. (b) Electrode P/cathode Q / anode Ions that are Na +, H+ Cl- , OH- attracted Ions that are Hydrogen ion Chloride ion selectively discharged reason H + ions are Concentration of lower in the Cl- ions are higher electrochemical than OH- ions series equation 2H+ + 2e H2 2Cl- Cl2 + 2e-
- 3. • (c) experiment I II III explanation L is more M is more L is more electropositive electropositive electropositive than silver than silver than M L is higher than M is higher than L is higher than silver in the silver in the M in the electrochemical electrochemical electrochemical series series series L can displace M can displace M cannot silver from its silver from its displace L from solution solution its solution
- 4. • Silver, M and L • Increasing electropositive (ii) - Copper (II) nitrate - Silver