The hydrogen electrode is prepared electrochemically by depositingA. Platinum on copper metalB. Silver on platinum metalC. Platinum on platinum metalD. Palladium on palladium metal

The hydrogen electrode is prepared electrochemically by depositingA. P

1.	The hydrogen electrode is prepared electrochemically by depositingA. Platinum on copper metalB. Silver on platinum metalC. Platinum on platinum metalD. Palladium on palladium metal
Answer» Correct Answer - C The normal hydrogen electrode or standard hydrogen electrode, which is used as a primary reference, consists of a piece of platinum foil, which is cpateed electrolytically with a very finely-devided platinum known as platinum black to give it a large surface area, suspended in a molar solution of hydrogen ions. Pure hydrogen gas at `1` bar pressure is continually bubbed into the solution to keep it saturated and to expose the soil alternately to gas and solution. The platinum act as an electrical conductor and also facilitates the attainment of equilibrium between the gas and its ions in solution. In practice a 1.18 `M` solution of hydrochloric acid is used so that the activity (i.e. the effectivity concentration) of the hydrogen ions in solution is exactly unity.

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The hydrogen electrode is prepared electrochemically by depositingA. Platinum on copper metalB. Silver on platinum metalC. Platinum on platinum metalD. Palladium on palladium metal

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