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Integer Answer Type Questions: Electrochemistry | JEE Advanced | 35 Years Chapter wise Previous Year Solved Papers for JEE PDF Download
Integer Value Correct Type
1. All the energy released from the reaction X → Y, ΔrG° = –193 kJ mol–1 is used for oxidizing M+ as M+ → M3+ + 2e–, E° = –0.25 V
Under standard conditions, the number of moles of M+ oxidized when one mole of X is converted to Y is [F = 96500 C mol–1] (JEE Adv. 2015)
Ans: 4
Solution :
Hence DG° for oxidation will be
ΔG° = – nFE°
= –2 × 96500 × (–0.25) = 48250 J = 48.25 kJ
48.25 kJ energy oxidises one mole M+
∴ 193 kJ energy oxidises 
mole M+ = 4 mole M+
2. The molar conductivity of a solution of a weak acid HX (0.01 M) is 10 times smaller than the molar conductivity of a solution of a weak acid HY (0.10 M). If 
the difference in their pKa values, pKa(HX) – pKa (HY), is (consider degree of ionization of both acids to be <<1) (JEE Adv. 2015)
Ans: 3
Solution :
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FAQs on Integer Answer Type Questions: Electrochemistry - JEE Advanced - 35 Years Chapter wise Previous Year Solved Papers for JEE
| 1. What is electrochemistry? |  |
Ans. Electrochemistry is the branch of chemistry that deals with the study of the interconversion of chemical and electrical energy. It involves the study of chemical reactions that take place at the interface of an electrode-electrolyte solution system.
| 2. What are electrodes and electrolytes in electrochemistry? | |
Ans. Electrodes are solid conductors that are used to transfer electrons to or from an electrolyte solution. They are classified as either anode (where oxidation occurs) or cathode (where reduction occurs). Electrolytes, on the other hand, are solutions or molten salts that conduct electricity by the movement of ions.
| 3. What is the significance of the Nernst equation in electrochemistry? | |
Ans. The Nernst equation is a fundamental equation in electrochemistry that relates the concentration of reactants and products to the electrode potential. It helps in determining the equilibrium potential of an electrochemical cell and predicts the direction and extent of the reaction.
| 4. How does electroplating work in electrochemistry? | |
Ans. Electroplating is a process used to coat a metal object with a thin layer of another metal. It involves the use of an electrolytic cell, where the metal object to be plated acts as the cathode and a metal salt solution acts as the electrolyte. When a direct current is applied, metal cations from the electrolyte are reduced at the cathode, resulting in the formation of a metal coating on the object.
| 5. What is corrosion and how does it relate to electrochemistry? | |
Ans. Corrosion is the process of deterioration of a metal due to chemical reactions with its surroundings. Electrochemistry plays a crucial role in corrosion, as it involves the transfer of electrons from the metal to the corrosive environment. This leads to the formation of metal ions, which can further react with the surrounding medium, causing the metal to degrade over time.
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