What happens at the anode during anodising?
Oxygen gas reacts with aluminium to form oxide
Anodising forms a thick oxide layer on aluminium. A clean aluminium article is made the anode and electrolysed with dilute sulphuric acid.
Oxygen gas is released at the anode. It reacts with the aluminium to make a thicker protective layer of aluminium oxide, which resists corrosion and can be dyed.
Hydrogen, not oxygen, is released at the cathode.
Hence, the answer is Oxygen gas reacts with aluminium to form oxide.
Similar Questions
Which of the following statements are correct for electrolytic refining? a. Copper, zinc, and nickel are refined electrolytically. b. In this method, a thin strip of pure metal is used as cathode. c. The insoluble impurities settled at bottom of the anode are known as anode mud.
Which of the following is a product formed at the cathode during the electrolysis of brine?
In electrolytic refining, the pure metal is used as:
Anodising is a process used to improve the appearance and durability of aluminium articles. Which of the following statements best explains the principle behind anodising?
Which method is commonly used to extract sodium from its compound?
During the electrolytic refining of copper, which of the following correctly matches the components and their roles?
Component Role in Refining Process A. Pure Copper i. Anode B. Impure Copper ii. Cathode C. Acidified Copper Sulphate iii. Electrolyte
Important Questions from Electrochemistry
- At $298 \, K$, given the standard electrode potentials: $E^\circ_{Cu^{2+}/Cu} = 0.34 \, V$, $E^\circ_{Zn^{2+}/Zn} = -0.76 \, V$, $E^\circ_{Fe^{2+}/Fe} = -0.44 \, V$, and $E^\circ_{Ag^{+}/Ag} = 0.80 \, V$.
Based on these values, which of the following reactions is NOT expected to occur spontaneously under standard conditions? - Which of the following processes is required for extracting metal from cinnabar ore?
You are given three metals 'X', 'Y' and 'Z'. Metal 'X' is found to react with an aqueous solution of both YSO 4and ZSO 4whereas metal 'Z' is found to react only with aqueous solution of YSO 4. Based on these observations, select the correct statement from the following.
The mobility of a divalent cation in water is 8 × 10-8 m2 V-1 s-1. The effective radius of the ion is (viscosity of water = 1 cP : c = 1.6 × 10-19 C)
The electrical double layer model among the following that consists of both fixed and diffuse layers is
