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WorksheetsModule-2
Total questions: 19
Worksheet time: 10mins
The process of deterioration of a metal due to unwanted chemical or
electrochemical interaction of the metal with its environment is called
___________
Electrolysis
Electrodialysis
Decomposition
Corrosion
The part of the nail inside the wall will _________
get corroded
is not affected
When zinc and iron are electrically connected, which one gets corroded?
Zinc
Iron
Can't decide
None of the above
Select the incorrect statement from the following option.
Replacement of corroded equipment is time-consuming
Corrosion causes contamination of product
Corrosion increases the electrical conductivity of metals
Corrosion causes leakage of toxic liquid or gases
When gold and cobalt are electrically connected, which one gets corroded?
Gold
Cobalt
None of the above
Lower the pH, _____________ the corrosion rate.
Greater
Lower
Remain Constant
None of the above
Electrochemical corrosion takes place at
Cathodic Area
Anodic Area
Near Cathode
Near Anode
Coating a layer of zinc on iron by hot
dipping method is called _________
Electroless plating
Galvanization
Anodization
Cathodic Protection
In differential aeration corrosion
Poor oxygenated part acts as cathode
Rich oxygenated part acts as anode
Poor oxygenated part acts as anode
Metal as a whole acts as cathode
The localized attack of a corroding environment leading to the formation of holes in an otherwise relatively un-attacked surface of a metal is called____
Water-line corrosion
Galvanic corrosion
Concentration cell corrosion
Pitting corrosion
Rate of corrosion is highest when
Iron (Eo= -0.44V) is in contact with zinc (Eo= -0.76V)
Iron (Eo= -0.44V) is in contact with copper (Eo= 0.34V)
Zinc (Eo= -0.76V) is in contact with tin (Eo= -0.14V)
Gold (Eo= 1.38V) is in contact with silver (Eo= 0.8V)
The flux _____ & ______ helps the molten metal to adhere (adsorb) on the metal surface during Galvanization process
Zinc Chloride; Ammonium Chloride
LiPF6 , Ethylene carbonate
Cobalt chloride;
Ferrous sulfate
Zinc Sulfate,
ferrous sulfate
__________ is the process of oxidation of outer layer of metal to its metal oxide by electrolysis.
Metallurgy
Anodization
Galvanization
Tinning
In ______ method the base metal to be protected from corrosion is brought in contact with more anodic metals like Zn, Mg, Al, etc.,
Sacrificial Anodic method
Galvanization
Anodization
Chemical formula of rust is
Fe(OH)2 ;
Ferrous hydroxide
Fe2O3·3H2O
Hydrated ferric oxide
FeO
Iron (II) oxide
Fe3O4·3H2O
Hydrated Ferrous ferric oxide
Rusting can be prevented by
Alloying
Tinning
Galvanizing
All of above
___________two Noble metals are less susceptible for corrosion.
Gold & Platinum
Iron & copper
stainless steel and aluminium
tin and brass
To protect iron against corrosion, the most durable metal plating on it, is
Zinc plating
Nickel Plating
Copper plating
'Paper pins inside the paper gets corroded and the exposed part is free from corrosion'.
Above statement illustrates_________ type of corrosion
differential metal corrosion
differential aeration corrosion
stress corrosion
crevice corrosion
