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  • Choose the correct options : a) Rate of corrosion is influenced by the relative sizes of cathodic and anodic areas  b) A metal with low hydrogen and voltage on its surface

Choose the correct options :

a) Rate of corrosion is influenced by the relative sizes of cathodic and anodic areas 

b) A metal with low hydrogen and voltage on its surface is more suspectible for corrosion 

c) Aluminium is less corrosive than iron 

d) Chromatic conversion can be used to protect metals like zinc or cadmium  

Option: 1

a,b


Option: 2

b,c,d


Option: 3

a,c


Option: 4

a,b,c,d


Answers (1)

best_answer

As we have learned

Factor affecting corrosion -

1. Reactivity of metals

2. Presence of moisture and atmospheric gases like CO2 SO2 etc.

3. Presence of impurity

4. Presence of electrolyte

5. Strains in the metal

-

 

  a) larger the area exposed , greater the rate of corrosion

b) low hydrogen over voltage makes liberation of H2 gas easier and speeds up cathodic reaction 

c) Aluminium forms a protective layer on its surface 

d) chromate conversion is used to protect metals 

 

 

 

 

Posted by

Riya

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