The Galvanic and Electrolytic Cells

(112) During corrosion,

(a) the Anodic part undergoes oxidation.

(b) the cathodic part undergoes oxidation.

(c) the anodic part undergoes reduction.

(d) neither cathodic nor anodic parts undergo any changes.

(111) When a buried pipeline is protected from corrosion by connecting with magnesium block, it is called

(a) impressed voltage protection.

(c) Sacrificial anodic protection.

(b) sacrificial cathodic protection.

(d) electroplating.

(110) Corrosion of iron takes place when ----

(109) The cathode reaction in each of fuel cell and rusting process of

iron represents by the equation -----

(a) CoO_2(s)+Li_(aq) + e^-  >>> LiCoO_2(s)

(b) PbO_2(s)+4H⁺_(aq)+SO₄^2-_(aq)+2e^- >>>PbSO_4(s) +2H₂O_(l)

(C)O_2(g) + 4e^- >>> 4OH^{-(aq) .}

(d) 2Fe²⁺_(aq) + 4e^- >>> 2Fe^o_(s)

(108) Rusting of iron is -----

(107) The process of corrosion enhanced by ------

(105) Chemical formula of iron rust is

(a) Fe(OH)₂

(b) FeO

(e) Fe,O

(D) Fe(OH)₃

(104) Electrochemical corrosion takes place

(103) Destruction of metal starts -------

(102) Anodic reaction involves dissolution of metal as the corresponding metallic ions with liberation of -----

(122)------ play(s) an important role in the corrosion of metals.

(121) The layer formed on the surface of corroded metal is (are) ....

(120) Rusting process occurs in a fast form when the water causing rust contain "explain your answer"

(119) If the cathodic coating scratched, it

(118) Anodic coating protects the metal -----

(117) All the following protect a piece of iron from rust, except -----

(116) The deciding factor in an atmospheric corrosion is ----- 

(115) During corrosion of iron in an aqueous solution

(114) During galvanic corrosion, the more noble metal acts as a/an

(113) Electrochemical corrosion can occur only if ------

(13) An example of electro-purification is the

(a) extraction of aluminum from bauxite.

(b) Purification of lead from an impure lead anode.

(c) recovery of zinc from zine sulphate solution.

(d) production of chlorine from sodium chloride solution.

(12) In the electro-purification of lead, pure lead is deposited on the cathode from an impure lead anode. In this process, lead is

(a) reduced at the anode.

(b) Oxidized at the anode.

(c) reduced at the anode and the cathode.

(d) oxidized at the anode and the cathode.

(11) To plate a nickel coin with copper,

(a) The nickel coin must be the cathode.

(b) the cathode must be made of copper.

(c) the electrons must flow to the anode.

(d) the solution must contain nickel ions.

(10) The following equation represents the electrolysis of sodium chloride solution:

2NaCl_(s)+2H₂O_(l)  >>> 2NaOH_(aq) + H_2(g) + Cl_2(g)

If pH value of the solution changes during the electrolysis process by 4, the pH value of the solution formed at the end of the process is

(a) 3  (b) 7  (c) 10 (D) 11

(7) When 1.0 M Nal is electrolyzed, bubbles of gas are formed on one electrode and a reddish-brown substance is formed on the other.

The half reaction at the cathode is ---------

(a)2I^- >>> I₂^o   + 2e^- 

(b)Na⁺ + e^- >>> Na^o

(c) H₂O >>>1/2 O₂ +2H⁺ +2e^-

(D)2H₂O + 2e^- >>> H₂^o + 2OH^-

(6) When a molten aluminum oxide is electrolyzed, the cathode reaction

(a) Al^o >>> Al³⁺ + 3e^-

(c) O^o₂ +4e^- >>> 2O^-

(B) Al³⁺ + 3e^- >>> Al^o

(d)2O^2- >>> O^o₂ + 4e^-

(4) -------- represents the correct information.

(3) Which metals can be precipitated by electrolysis in a solution containing Na⁺ , Cu²⁺, Mg²⁺, Ag⁺ ions? -----------------

(2) On passing ( If) through an electrolyte, it leads to dissolution evolution or deposites from the substance at any electrode

(1) The process of applying an electric current through a cell to produce a change is called ------