Chemistry NCERT Exemplar Solutions Class 12th Chapter Three

For the given cell, net redox reaction is as;

$H_2\left(g\right)+2A{g}^{+}\left(aq\right)\to 2H^{+}\left(aq\right)+2Ag\left(s\right)$               

n = 2

$E_{cell}^0=+0.5332V$               

Using;  $\Delta G^0=-nF{E}_{cell}^0$  

$=-2*96487*0.5332J/mo\mathcal{l}$               

$=-102.89kJ/mo\mathcal{l}$               

Now, for the reaction

$\frac{1}{2}{H}_2\left(g\right)+A{g}^{+}\left(aq\right)\text{?}\to H^{+}\left(aq\right)+Ag\left(s\right)$               

n = 1

So; $\Delta G^o=-1*96487*0.5332J/mo\mathcal{l}$  

=  $-51.44kJ/mo\mathcal{l}$

For isoelectronic species

$Ionicradii\propto \frac{Numberofe}{Numberofp}$              

$\begin{array}{l}N{a}^{+}M{g}^{2+}{N}^{3-}{O}^{2-}{F}^{-}\\ e=1010101010\\ p=1112789\end{array}$                

Hence, correct order of ionic radii is;

$M{g}^{2+}<N{a}^{+}<F^{-}<O^{2-}<N^{3-}$                

jhvjhvjhvjhvouvuyvuyvuy

The NCERT Exemplar questions go beyond the textbook questions as they are designed to be more challenging and conceptually advanced. Practicing the NCERT exemplar provides a better understanding of complex topics like conductance and electrochemical cells. It also helps in better preparation for the entrance exams. The exemplar often involves multi-concept, application-based, and analytical problems.

A salt bridge in a galvanic cell maintains electrical neutrality by allowing the ions to flow between the two half-cells. It ensures the continuous flow without participating in the reaction. The salt bridge prevents the charges accumulation as such an accumulation can halt the electrochemical reaction by stopping the flow of electrons.

The Nernst equation in Electrochemistry is important because, under non-standard conditions, it allows us to calculate the electrode potential of the half and full cell. This equation shows how the potential of the cell varies with the temperature, concentration, and pressure. In electrochemical cells, it helps in predicting the spontaneity and direction of redox reactions.

This is a Assertion and Reason Type  as classified in NCERT Exemplar

Ans: Correct Option: (iv)

  (i) Copper sulfate can't be stored in zinc vessels due to less reactive nature than zinc due to the negative standard reduction value of zinc.

So both assertion and reason are false. Therefore, this option is incorrect.

This is a Assertion and Reason Type  as classified in NCERT Exemplar

Ans: Correct Option: (i)

(i)At the equilibrium stage E $°$ _cell = 0 and current stops flowing in the cell. Therefore, the assertion is correct, the reason is correct and the reason is the correct explanation for assertion. Therefore, this option is correct

(ii)  Assertion is correct, the reason is correct and the reason is the correct explanation for assertion. Therefore, this option is incorrect

This is a Assertion and Reason Type  as classified in NCERT Exemplar

Ans: Correct Option: (i)

 The resistance of an ionic solution is measured by alternating current. The concentration of DC changes with electrolysis. Therefore, the assertion is correct, the reason is correct and the reason is a correct explanation of the assertion.