Question

Which of the following is not an application of electrochemical series?

• A. To compare the relative oxidising and reducing power of substances
• B. To predict evolution of hydrogen gas on reaction of metal with acid
• C. To predict spontaneity of a redox reaction
• D. To calculate the amount of metal deposited on cathode

Answer 1

Answer: (D)

To calculate the amount of metal deposited on cathode

The various applications of electrochemical series are-

• To compare the relative oxidising and reducing power of substances
  
• To predict the evolution of hydrogen gas on the reaction of metal with acid
  
• To predict spontaneity of a redox reaction
  
• To predict whether a given metal will displace another, from the salt solution.

The amount of metal deposited on the cathode is calculated by Faraday's first law. It states that 'The mass of the substance (m) deposited or liberated at any electrode is directly proportional to the quantity of electricity or charge (Q) passed.

Hence, the correct answer is option $\text{D}$.