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Why Cr is used for coating Fe ?...

Why `Cr` is used for coating `Fe` ?

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### Step-by-Step Solution: 1. **Understanding Corrosion**: - Corrosion is the process by which metals deteriorate due to environmental factors. For iron, this process is commonly known as rusting, which occurs when iron reacts with oxygen and moisture in the air. 2. **The Problem with Iron**: - When iron is exposed to air and moisture, it forms iron oxide (rust), which weakens the metal and can lead to structural failure. This makes iron less durable when used in various applications. ...
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Which is a stronger reducing agent Cr^(2+) or Fe^(2+) and why?

(i) On the basis of the standard electrode potential values stated for acid solutions, predict whether Ti^(4+) species may be used to oxidise Fe(II) to Fe(III) {:(Ti^(4+) + e^(-) to Ti^(3+), E^(@) = +0.01V), (Fe^(3+) + e^(-) to Fe^(2+), E^(@)= +0.77V):} (ii) Based on the data arrange Fe^(3+), Mn^(2+) " and " Cr^(2+) in the increasing order of stability of +2 oxidation state. (Give a brief reason) E_(Cr^(3+)//Cr^(2+))^(@) = -0.4V E_(Mn^(3+)//Mn^(2+))^(@) = +1.5V E_(Fe^(3+)//Fe^(2+))^(@) = +0.8V

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CENGAGE CHEMISTRY ENGLISH-NCERT BASED EXERCISE-Electrolysis, Batteries , and Rusting
  1. What is meant by electrochemical equivalent of a substance?

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  2. An aqueous solution of CuSO(4) is electrolyszed using Pt electrodes in...

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  3. What are the products of the electrolysis of aqueous solution of KF ?

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  4. Silver is conducting as such while AgNO(3) is conducting in molten sta...

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  5. Why Zn reacts with dilute H(2)SO(4) to give H(2) gas but Cu does not ?

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  6. What is overvolatage or bublle voltage ?

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  7. Which allotrope of carbon is used for making electrodes?

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  8. Name the electrolyte used in dry cell.

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  9. What would happen if the protective tin coating over an iron bucket i...

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  10. Which type of metal can be used in cathodic protection of iron agains...

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  11. Write the names of the electrodes used in fuel cell.

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  12. Name the electrolyte used in fuel cell and mercury cell.

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  13. State True or False Rusting of Fe is quicker in saline water than in ...

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  14. Why Cr is used for coating Fe ?

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  15. What is the role of ZnCl(2) in dry cell ?

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  16. Why a mercury cell gives a constant voltage throughout its life ?

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  17. Which types of cells are rechargeable ?

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  18. Why a dry cell becomes dead after a long time even if it is not used ?

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  19. Why lead storage can be recharged ?

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  20. Out of Sn and Zn which one protects Fe better even after cracks ?

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