Section A
Q1. The observed nitrogen-oxygen bond length in nitrate ion is 1.21 Å. However, the calculated bond lengths for N—O and N = O bonds are 1.36 Å and 1.15 Å respectively. Account for this with requisite structures. In a cubic close-packed structure of a mixed oxide, the lattice is made up of oxide ions (O2-), one-eighth of tetrahedral voids are occupied by divalent ions (A2+), while one-half of octahedral voids are occupied by trivalent ions (B3+). What is the formula of the oxide? The equilibrium pressure of H2(g) over solid uranium and uranium hydride, UH3, at 500 K is very low and its value is 139 Pa. Calculate the standard Gibbs energy of formation of UH3(s) at 500 K and 1 atm. Select the figure below that illustrates the correct dependence of the molar Gibbs free energy, Ḡ, on pressure P at constant temperature for a single solid component. Explain your choice : Draw and explain the shapes of steady-state current potential curves of the following systems with the same open-circuit potential and same diffusion limiting currents:
(d) Select the figure below that illustrates the correct dependence of the molar Gibbs free energy, Ḡ, on pressure P at constant temperature for a single solid component. Explain your choice :
(d) (i)
(d) (ii)
(d) (iii)
(d) (iv)
(e) (i) A fast system
(e) (ii) A slow system
