JEE Main 2022 · 27 Jun · Shift 2 · Chemistry Q87

ChemistryInteger+4 / -1Question 87 of 90

For the reaction taking place in the cell:
$\mathrm{Pt(s)|H_2(g)|H^+(aq)\,||\,Ag^+(aq)|Ag(s)}$
$E^\circ_{\rm cell}=+0.5332$ V.

The value of $\Delta_fG^\ominus$ is ______ kJ mol $^{-1}$ . (in nearest integer)

Your answer

Answer and worked solution

Official answer: 51

Cell reaction. $\mathrm{\frac12H_2+Ag^+\rightarrow H^++Ag}$ , $n=1$ : $\Delta G°=-96500\times0.5332\approx-51.5$ kJ.

Formation of $\mathrm{Ag^+}$ . All other species have $\Delta_fG°=0$ , so $\Delta_fG°(\mathrm{Ag^+})=+51$ kJ mol $^{-1}$ .

Answer: 51

JEE Main 2022 · 27 Jun · Shift 2, Chemistry question 87