Short Answer TypeOn the basis of crystal field theory, write the electronic configuration for d4 ion if ∆o < P ?
Write the hybridization and magnetic behaviour of the complex [Ni(CO)4].
(At.no. of Ni = 28)
Calculate emf of the following cell at 25 °C:
Fe | Fe2+(0.001 M) || H+ (0.01 M) | H2 (g) (1 bar) | Pt(s)
E°(Fe2+ | Fe) = –0.44 V E°(H+ | H2 ) = 0.00 V
Give reasons for the following observations:
Lyophilic sol is more stable than a lyophobic sol.
Give reasons for the following observations:
It is necessary to remove CO when ammonia is prepared by Haber's process.
3.9 g of benzoic acid dissolved in 49 g of benzene shows a depression in freezing point of 1.62 K. Calculate the van't Hoff factor and predict the nature of solute (associated or dissociated).
(Given: Molar mass of benzoic acid = 122 g mol-1, Kf for benzene = 4.9 K kg mol-1
What is the role of silica in the extraction of copper?
Ores of copper contain iron oxide as an impurity. Silica reacts with iron oxide and forms iron silicate, which is removed as slag. In the smelting process such chemical reactions are taking place:
1) Oxidizing of the copper pyrite: 2 CuFeS2 (s) + 3 O2 (g) → 2 FeO (s) + 2 CuS (l) + 2 SO2 (g)
2) Conversion of iron oxides and sulfides into molten slag:
FeO (s) + SiO2 (s) → FeSiO3 (l)
2 FeS (s) + 3O2 (g) + 2 SiO2 (s) → 2 FeSiO3 (l) + 2SO2 (g)
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