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In the electrolysis of aqueous sodium chloride solution, two types of reactions can take place at anode :
I. 2Cl- (aq) → Cl2(g) +2e-
II. 2H2O(l)g → O2 (g) + 4H+(aq) + 4e-
Select the correct statement(s) about these.
  • a)
    Electrode potentials of I and II are quite similar
  • b)
    I is favoured in higher (NaCl) and II is favoured in higher pH.
  • c)
    Because of overvoltage ,Cl2 and not O2 is formed
  • d)
    Electrode potentials of I and II are different
Correct answer is option 'A,B,C'. Can you explain this answer?
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In the electrolysis of aqueous sodium chloride solution, two types of ...
 
(c) Experrnent indicates that the applied voltage required is always greater than the voltage calculated from the standard E0ox or E0red. The additional voltage required is called overvoltage. Due to this, Cl2 and not O2 s formed. This, (c) 6 correct. 
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In the electrolysis of aqueous sodium chloride solution, two types of ...
Explanation:

Electrode potentials:
- The electrode potential of reaction I (2Cl-(aq) → Cl2(g) +2e-) is around +1.36 V, while that of reaction II (2H2O(l) → O2(g) + 4H+(aq) + 4e-) is around +1.23 V.
- The electrode potentials of I and II are different.

Favorability of reactions:
- In higher concentrations of NaCl, reaction I (formation of Cl2) is favored due to the higher concentration of chloride ions available for oxidation.
- In higher pH conditions, reaction II (formation of O2) is favored as the concentration of H+ ions is lower, making it easier for water to be oxidized.

Overvoltage:
- Overvoltage refers to the additional potential that must be applied to drive a reaction at the electrode due to kinetic factors.
- In the electrolysis of aqueous NaCl solution, overvoltage plays a role in the formation of Cl2 gas at the anode, as the evolution of O2 gas at the anode requires a higher overvoltage.
Therefore, the correct statements are A (Electrode potentials of I and II are different), B (I is favored in higher (NaCl) and II is favored in higher pH), and C (Because of overvoltage, Cl2 and not O2 is formed).
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Read the passage given below and answer the following questions:All chemical reactions involve interaction of atoms and molecules. A large number of atoms/molecules are present in a few grams of any chemical compound varying with their atomic/molecular masses. To handle such large numbers conveniently, the mole concept was introduced. All electrochemical cell reactions are also based on mole concept. For example, a 4.0 molar aqueous solution of NaCl is prepared and 500 mL of this solution is electrolysed. This leads to the evolution of chlorine gas at one of the electrode. The amount of products formed can be calculated by using mole concept.The following questions are multiple choice questions. Choose the most appropriate answer:Q. In electrolysis of NaCl when Pt electrode is taken then H2 is liberated at cathode while with Hg cathode it forms sodium amalgam

In the electrolysis of aqueous sodium chloride solution, two types of reactions can take place at anode :I. 2Cl-(aq)→ Cl2(g) +2e-II. 2H2O(l)g→ O2(g) + 4H+(aq) + 4e-Select the correct statement(s) about these.a)Electrode potentials of I and II are quite similarb)I is favoured in higher (NaCl) and II is favoured in higher pH.c)Because of overvoltage ,Cl2and not O2is formedd)Electrode potentials of I and II are differentCorrect answer is option 'A,B,C'. Can you explain this answer?
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In the electrolysis of aqueous sodium chloride solution, two types of reactions can take place at anode :I. 2Cl-(aq)→ Cl2(g) +2e-II. 2H2O(l)g→ O2(g) + 4H+(aq) + 4e-Select the correct statement(s) about these.a)Electrode potentials of I and II are quite similarb)I is favoured in higher (NaCl) and II is favoured in higher pH.c)Because of overvoltage ,Cl2and not O2is formedd)Electrode potentials of I and II are differentCorrect answer is option 'A,B,C'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about In the electrolysis of aqueous sodium chloride solution, two types of reactions can take place at anode :I. 2Cl-(aq)→ Cl2(g) +2e-II. 2H2O(l)g→ O2(g) + 4H+(aq) + 4e-Select the correct statement(s) about these.a)Electrode potentials of I and II are quite similarb)I is favoured in higher (NaCl) and II is favoured in higher pH.c)Because of overvoltage ,Cl2and not O2is formedd)Electrode potentials of I and II are differentCorrect answer is option 'A,B,C'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In the electrolysis of aqueous sodium chloride solution, two types of reactions can take place at anode :I. 2Cl-(aq)→ Cl2(g) +2e-II. 2H2O(l)g→ O2(g) + 4H+(aq) + 4e-Select the correct statement(s) about these.a)Electrode potentials of I and II are quite similarb)I is favoured in higher (NaCl) and II is favoured in higher pH.c)Because of overvoltage ,Cl2and not O2is formedd)Electrode potentials of I and II are differentCorrect answer is option 'A,B,C'. Can you explain this answer?.
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