Chemistry · 2013
JEE Main · 25 April 2013, Shift 1 · Q50
The Gibbs energy for the decomposition of Al_2 O_3 at 500^° C is as follows: 2/3 Al_2 O_3 → 4 / 3 Al + O_2, Δ_r G =+940 kJ mol^-1 The potential…
The Gibbs energy for the decomposition of $\displaystyle \mathrm{Al}_2 \mathrm{O}_3$ at $\displaystyle 500^{\circ} \mathrm{C}$ is as follows :
$$\frac{2}{3} \mathrm{Al}_2 \mathrm{O}_3 \rightarrow 4 / 3 \mathrm{Al}+\mathrm{O}_2, \Delta_{\mathrm{r}} \mathrm{G}=+940 \mathrm{~kJ} \mathrm{~mol}^{-1}
$$
The potential difference needed for the electrolytic reduction of aluminium oxide at $\displaystyle 500$°C should be atleast :
Official answer
(4)
2.$\displaystyle 5$ V
More from Electrochemistry
- The equivalent conductance of NaCl at concentration C and at infinite dilution are λ_C and λ_∞, respectively. The correct relationship between λ_C…2014
- The conductivity of a weak acid HA of concentration 0.001 mol L^-1 is 2.0 × 10^-5 Scm^-1. If Λ_m^°(HA)=190 Scm^2 mol^-1, the ionization constant…2021
- The E^° (volt) values are: Al^3+ / Al,-1.66, Sc^3+ / Sc,-2.08, Fe^3+ / Fe^2+, +0.77, Hg_2^2+ / Hg,+0.79. Arrangement of cations, Al^3+, Sc^3+, Fe^3+…2022
- In which of the following half cells, electrochemical reaction is pH dependent?2022
- At 298 K, a 1 litre solution containing 10 mmol of Cr_2 O_7^2- and 100 mmol of Cr^3+ shows a pH of 3.0. Given: Cr_2 O_7^2- → Cr^3+; E^°=1.330 V and…2023
- The product, which is not obtained during the electrolysis of brine solution is2023
- The solubility product of a sparingly soluble salt A_2 X_3 is 1.1 × 10^-23. If specific conductance of the solution is 3 × 10^-5 S m^-1, the limiting…2022
- Two Faraday of electricity is passed through a solution of CuSO_4. The mass of copper deposited at the cathode is: (at. mass of Cu=63.5 amu)2015
JEE Main 2013 Chemistry question, with the answer from NTA’s final answer key. Where our answers come from.