19 questions in Redox and electrolysis at Form 5 · BGCSE
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- In electrolysis, positive ions move to the…
- What is produced at the cathode in the electrolysis of molten lead(II) bromide?
- Concentrated sodium chloride solution (brine) is electrolysed with inert electrodes.
- Chlorine is produced by electrolysis of concentrated aqueous sodium chloride.
- A steady current of 15 A was allowed to flow through the electrolyte for 1 hour 30 minutes. The equation shows how chlorine is produced: 2Cl⁻ → Cl₂ +…
- Acidified potassium dichromate, K₂Cr₂O₇, also oxidises concentrated hydrochloric acid: K₂Cr₂O₇ + 14HCl → 2KCl + 2CrCl₃ + 3Cl₂ + 7H₂O
- The diagram shows a metallic fork electroplated using silver (silver anode, fork cathode, aqueous silver sulphate). 0.54 g of silver was deposited on…
- The diagram shows a cell used to extract aluminium from its ore, bauxite, which contains aluminium oxide. A steady current of 15.0 A was allowed to p…
- Molten chloride of a metal X is electrolysed using graphite electrodes P (connected to the negative terminal) and Q.
- To determine the charge on the ion of metal X, a current of 1.0 A was passed for 16 minutes 5 seconds through the molten chloride of metal X. 0.32 g …
- Chromium, Cr, is a transition metal. It is obtained from its oxide by the reaction Cr₂O₃ + 2Al → Al₂O₃ + 2Cr.
- When an electric current is passed through the circuit shown for a set time, 0.54 g of silver is deposited on the cathode in cell I (silver nitrate).…
- Lead(II) bromide, PbBr₂, is electrolysed using inert electrodes as shown (molten, heated, with a bulb in the circuit).
- 0.414 g of lead was deposited at the cathode when a current of 2.5 A was passed. (Ar Pb = 207; 1 Faraday = 96 500 coulombs)
- The diagram shows how an experiment was set up to investigate the electrolysis of aqueous nickel(II) sulphate using carbon electrodes. Oxygen is coll…
- In the electrolysis experiment, a current of 19.3 A was passed through the cell for 1 minute 40 seconds. (1 faraday = 96 500 coulombs; 1 mole of gas …
- The diagram shows a simple cell: copper and zinc electrodes in dilute sulphuric acid, connected through a voltmeter. The experiment was repeated with…
- The diagram shows the laboratory preparation of chlorine from manganese dioxide and concentrated hydrochloric acid. The gas passes through liquid Y, …