16. Which of following metals could provide cathodic protection o A. Al & Cu 17.

Question

16. Which of following metals could provide cathodic protection o A. Al & Cu 17. M A. Sacrificial anode 18. When a buried pipeline is protected from corrosion by connecting two B. AI&Zn; ore active metal used C Zn & Cu DAl&N; in sacrificial anodic protection method is known as, B. Sacrificial cathode C Active anode D. Active cathode is called, a) Impressed voltage protection c) Sacrificial anodic protection 19. Pure water does not conduct electricity because it is magnestum block,t b) Sacrificial cathodic protection d) Any of these a) Neutral b) Low boiling c) Almost not ionized d) Decomposed easily 20. Using a table of standard reduction potentials, decide if the following reaction is spontaneous or non-spontaneous Ag2O(s) Zn(s) H20Zn(OH)s)2Ag(s) a. Spontaneous b. Non-Spontaneous 21. The phenomenon by which a metal or alloy show high corrosion resistance due to formation of highly protective film is called a) Electrolysis View Answer c) Galvanisation d) Passivation b) Electrodialysis 22. What is the equilibrium constant expression, Kc, for this reaction. 2 CO(g) + O2(g) 2CO2(g) (a) Kc - klCo) lo1 (b) Kc [Co)21o2)/ (co21 (c) Kc= [CO2] / [CO] [02] (d) Kc [Co]2/(co2 [o2] (e) Kc= [CO]2102]/[C02]2 23. Suppose the equation in question 25 is rewritten as CO(g)+ 1/20218) with an equilibrium constant ke. What is the relationship between Kc and Kc? (a) Kc' Kc (i.e. no change) (b) Kc' (Kc) 1/2 (c) Kc,-X(Kc)

Explanation / Answer

Ans 16 : B) Al & Zn

In cathhoding protection the parent metal (here iron) is prevented from corrosion by applying a layer of self sacrificial metal which corrodes itself and protects the metal underneath it.

Since here Zinc and aluminium are more reactive , they would react as anode forming their oxides and the iron below it will behave as cathode.

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