Pick out the incorrect statement :- | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(D) In a galvanic cell,the electrical work done is given by $W_{elec} = nFE_{cell}$.For a spontaneous reaction,$\Delta G < 0$,which implies $E_{cell}

Vedclass · Accepted Answer

The magnitude of electrical work obtained from a galvanic cell always exceeds $|\Delta H|$ for the cell reaction.

Vedclass · Answer

(D) In a galvanic cell,the electrical work done is given by $W_{elec} = nFE_{cell}$.For a spontaneous reaction,$\Delta G  0$.At equilibrium,$\Delta G = 0$,which implies $E_{cell} = 0$.The electrical work obtained is related to the change in Gibbs free energy,$\Delta G = \Delta H - T\Delta S$.Since $\Delta G = -nFE_{cell}$,the maximum electrical work is $|\Delta G|$.According to the second law of thermodynamics,the electrical work obtained from a cell cannot exceed the total enthalpy change $|\Delta H|$ of the reaction,as some energy is always dissipated as heat $(T\Delta S)$.Therefore,the statement that electrical work always exceeds $|\Delta H|$ is incorrect.

Pick out the incorrect statement $:-$

Similar Questions

During the discharging of a lead storage cell,the concentration of $H_2SO_4$ reduces from $40\% \ w/w$ to $30\% \ w/w$. Find the total charge produced in $faraday$. Given the volume of the solution $= 4.9 \ L$ and density $= 1.2 \ g/mL$. (Assume volume and density remain constant)

Given that $Ni^{2+}/Ni = -0.25 \ V$; $Cu^{2+}/Cu = 0.34 \ V$; $Ag^{+}/Ag = 0.80 \ V$; $Zn^{2+}/Zn = -0.76 \ V$. Which of the following reactions under standard conditions will not take place in the specified direction?

Given ${E^o}_{Ag^{+}/Ag} = 0.80 \ V$,${E^o}_{Mg^{2+}/Mg} = -2.37 \ V$,${E^o}_{Cu^{2+}/Cu} = 0.34 \ V$,${E^o}_{Hg^{2+}/Hg} = 0.79 \ V$.
Which of the following statements is correct?

Vedclass Test Series

Exam Paper Generator

Online Exam Module