In the electrolysis of water ------
A)water is formed in the chamber and its called a combination reaction.
B)hydrogen gas and oxygen gas is formed at the electrodes and its called displacement reaction
C)hydrogen gas and oxygen gas is formed at the electrodes and its called electrolytic decomposition reaction
D)water breaks down to release hydrogen gas at the anode
Answers
Answer:
Electrolysis of water is its decomposition to give hydrogen and oxygen gases due to the passage of an electric current.
2H2O + electrical energy (+ heat energy) --> O2 + 2H2
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'I propose to distinguish these bodies by calling those anions which go to the anode ....and those passing to the cathode, cations '
Michael Faraday 1834
Introduction
Creating an electric potential through water causes positive ions, including the inherent hydrogen ions H3O+, to move towards the negative electrode (cathode) and negative ions, including the inherent hydroxide ions OH-, to move towards the positive electrode (anode). With a sufficient potential difference, this may cause electrolysis with oxygen gas being produced at the anode and hydrogen gas produced at the cathode (see [1878] for current reviews). The electrolysis of water usually involves dilute, or moderately concentrated, salt solutions to reduce the power loss driving the current through the solution, but the presence of salt is not a requirement for electrolysis.
Thus,
Anode +ve 6H2O(l) -> O2(g) + 4H3O+(aq) + 4e-(to anode) b E° = +1.229 V, pH 0 d E°' = +0.815 V
Cathode -ve 4e-(from cathode) + 4H2O(l) -> 2H2(g) + 4OH-(aq) E° = -0.828 V, pH 14 E°' = -0.414 V
Overall
2H2O(l) -> 2H2(g) + O2(g)
ΔG°' = +474.3 kJ ˣ mol-1
C) Hydrogen gas and oxygen gas is formed at the electrodes and is called electrolytic decompositon reaction
H2 will form at cathode and O2 will form at the anode
hope it's enough information