JEE Advanced · Chemistry · 17. Electrochemistry

In a galvanic cell, the salt bridge

A Does not participate chemically in the cell reaction.
B Stops the diffusion of ions from one electrode to another.
C Is necessary for the occurrence of the cell reaction.
D Ensures mixing of the two electrolytic solutions.

Verified Solution

Answer & Solution

Correct Answer

(A) Does not participate chemically in the cell reaction.

Step-by-step Solution

Detailed explanation

Salt bridge is introduced to keep the solutions of two electrodes separate, such that the ions in electrode donot mix freely with each other. But it cannot stop the process of diffusion.It does not participate in the chemical reaction. However, it is not necessary for occurence of cell reaction, aswe know that designs like lead accumulator, there was no salt bridge, but still reactions takes place.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

LIST-

I

contains metal species and LIST-

II

contains their properties.

List - I	List - II
(I) $\left[ Cr ( CN )_6\right]^{4-}$	(P) $t _{2 g}$ orbitals contain 4 electrons
(II) $\left[ RuCl _6\right]^{2-}$	(Q) $\mu$ spin - only $=4.9$ BM
(III) $\left[ Cr \left( H _2 O \right)_6\right]^{2+}$	(R) low spin complex ion
(IV) $\left[ Fe \left( H _2 O \right)_6\right]^{2+}$	(S) metal ion in 4 + oxidation state
	(T) $d ^4$ species

[Given: Atomic number of

Cr = 24, Ru = 44, Fe = 26

]
Match each metal species in LIST-

I

with their properties in LIST-

II

, and choose the correct option

JEE Advanced 2022 Hard

One mole of an ideal monoatomic gas undergoes two reversible processes $(A \to B$ and $B \to C)$ as shown in the given figure:

$A \to B$ is an adiabatic process. If the total heat absorbed in the entire process $(A \to B$ and $B \to C)$ is ${RT}_{2} \ln 10$ , the value of $2 {logV}_{3}$ is
[Use molar heat capacity of the gas at constant pressure, $C_{p, m} = \frac{5}{2} R$ ]

JEE Advanced 2023 Medium

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List - I	List - II
(I) \(\left[ Cr ( CN )_6\right]^{4-}\)	(P) \(t _{2 g}\) orbitals contain 4 electrons
(II) \(\left[ RuCl _6\right]^{2-}\)	(Q) \(\mu\) spin - only \(=4.9\) BM
(III) \(\left[ Cr \left( H _2 O \right)_6\right]^{2+}\)	(R) low spin complex ion
(IV) \(\left[ Fe \left( H _2 O \right)_6\right]^{2+}\)	(S) metal ion in 4 + oxidation state
	(T) \(d ^4\) species