Q0.
(a) Q1. Explain why aluminophosphate forms quartz-like structure.
(b) The stepwise formation constants for NH3 with [Cu(OH2)6]2+ are log Kf1 = 4.15, log Kf2 = 3.50, log Kf3 = 2.89, log Kf4 = 2.13, log Kf5 = -0.52. Why is Kf5 so different ?
(c) Both H- and P(C6H5)3 are ligands of similar field strength, high in spectrochemical series.
(d) Discuss the orbital factors that account for the field strength of each ligand. Why is methyl orange not a suitable indicator for titration of a strong base against a weak acid?
(e)
Explain how post-precipitation differs from co-precipitation.
(f) Explain the role of HgCl2 in the volumetric determination of iron using potassium dichromate.
(g) Explain the role of chelating agents in complexometric titrations.
(h) Arrange the following metal carbonyls in the increasing order of their increasing C–O bond strength giving reason: [Cr(CO)6], [Mn(CO)6]+, [V(CO)6]-.
(i) Complete the following nuclear reactions by giving the value of X: 147N + 42He → X + 11H; X + 4/2He → 30/15P + 1/0n; 2311Na + X → 2312Mg + 1/0n; 113/48Cd + X → 114/48Cd + energy; X → 0_-1e + 232/91Pa.
Why does the μ_eff value for transition metal ions with ground state term S agree well with μ_so value while it differs with metal ions having ground state term D or F? Explain with reason.
