∵ΔG∘=−nFE∘ Option (1)E∘=0.8+0.76=1.56 V∴ΔG∘=−2×F×1.56=−3.12 V Option (2) E∘=−2.37+0.76=−1.61 V∴ΔG∘=−2×F×(−1.61)=+3.22 V Option (3) E∘=−2.37−0.8=−3.17 VΔG∘=−2)×F×(−3.17)=+6.34 Option (4)E∘=0.8−0.34=0.46 VΔG∘=−2×F×0.46=−0.92 V
JEE Main 2025 — Chemistry Physical Chemistry
Standard electrode potentials for a few half cells are mentioned below : $\begin{aligned}
& \mathrm{E}{\mathrm{Cu}^{2+} / \mathrm{Cu}}^{\circ}=0.34 \mathrm{~V}, \mathrm{E}{\mathrm{Zn}^{2+} / \mathrm{Zn}}^{\circ}=-0.76 \mathrm{V} \
& \mathrm{E}_{\mathrm{Ag}^{+} / \mathrm{Ag}}^{\circ}=0.80 \mathrm{V}, \mathrm{E}_{\mathrm{Mg}^{2+} / \mathrm{Mg}}^{\circ}=-2.37 \mathrm{~V}
\end{aligned}Whichoneofthefollowingcellsgivesthemostnegativevalueof\Delta \mathrm{G}^{\circ}$ ?
Held on 23 Jan 2025 · Verified 6 Jul 2026.
ZnZn2+(1M)Ag+(1M)Ag
ZnZn2+(1M)Mg2+(1M)Mg
AgAg+(1M)Mg2+(1M)Mg
CuCu2+(1M)∥Ag+(1M)Ag
Sign in to track your attempts and accuracy.
Sign in to keep a private note on this question. Nothing you write is ever public.
80 mL of a hydrocarbon on mixing with 264 mL of oxygen in a closed U-tube undergoes complete combustion. The residual gases after cooling to 273 K occupy 224 mL. When the system is treated with KOH solution, the volume decreases to 64 mL. The formula of the hydrocarbon is :
What is the energy (in J atom$^{-1}$) required for the following process? $Li^{2+}(g) \rightarrow Li^{3+}(g) + e^-$ (Take the ionization energy for the H atom in the ground state as $2.18 \times 10^{-18}$ J atom$^{-1}$)
Consider the following reduction processes : $\mathrm{Al}^{3+}+3 \mathrm{e}^{-} \longrightarrow \mathrm{Al}(\mathrm{s}), \mathrm{E}^{0}=-1.66 \mathrm{~V}$ $\mathrm{Fe}^{3+}+\mathrm{e}^{-} \longrightarrow \mathrm{Fe}^{2+}, \mathrm{E}^{0}=+0.77 \mathrm{~V}$ $\mathrm{Co}^{3+}+\mathrm{e}^{-} \longrightarrow \mathrm{Co}^{2+}, \mathrm{E}^{0}=+1.81 \mathrm{~V}$ $\mathrm{Cr}^{3+}+3 \mathrm{e}^{-} \longrightarrow \mathrm{Cr}(\mathrm{s}), \mathrm{E}^{\circ}=-0.74 \mathrm{~V}$ The tendency to act as reducing agent decreases in the order :
X and Y are the number of electrons involved, respectively during the oxidation of $\mathrm{I}^{-}$to $\mathrm{I}_{2}$ and $\mathrm{S}^{2-}$ to S by acidified $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$. The value of $\mathrm{X}+\mathrm{Y}$ is $\_\_\_\_$.
Identify the correct statements from the following: A. Heisenberg uncertainty principle is applicable to electrons. B. The size of $2p_x$ orbital is less than the size of $3p_x$ orbital. C. The energy of $2s$ orbital of H atom is equal to the energy of $2s$ orbital of Li. D. The electronic configuration of Cr is $[\text{Ar}] 3d^5 4s^1$ Choose the correct answer from the options given below:
Work through every JEE Main Physical Chemistry PYQ, year by year.