Physical Chemistry Answers

Hydrogen gas at 1 atm pressure is bubbled through Ni2+ ions present in a purified solution
(obtained after solvent extraction). If the activity of Ni2+ in solution is 0.3, determine the minimum
pH required to precipitate Ni from the solution at 25oC. {Data: Standard oxidation potential for
H2/2H+ and Ni/Ni2+ are 0.0 V and 0.25 V respectively, R = 8.314 J/mol/K, Faraday constant = 96500
Coulomb/gm eqv wt}.

Electrorefining of copper using acidic copper sulphate solution is carried out at a current of
15000 A and 0.4 V. If the output per day (uninterrupted cell operation) is 410 kg on a total cathode
area of 10 m2

, calculate: a) current efficiency, b) current density and c) thickness of deposit. {Data:
Relative atomic mass of copper is 64; Faraday constant = 96500 Coulomb/gm eqv wt; density of
copper is 8930 kg m-3}.

The copper grade of a matte is 30%. Find the weight of Cu2S and FeS in 1 ton of the matte. If
the same matte is charge in a converter find the volume of air during slag-off phase and blister
formation phase of conversion.

A gas in a large sealed gas syringe absorbs 4Kj of heat thi causes the gas to expand reversibly and forces the piston with surface area 80cm² move 200cm upward against an external pressure of 690 mmHg calculate the change in internal energy

Predict and explain the effects of the given factors on the rate of the following reaction 2H2(g)+02(g)=2H2 0(1) 1.A platinum catalyst is introduced in the reaction container. 2. The reactant are place in a high pressure container.

Predict and explain the effects of the given factors on the rate of the following reaction 2H2(g)+02(g)=2H2 0(1) A platinum catalyst is introduced in the reaction container

Calculate volume of bromine vapour produced when a charge of 965 coulomb passas through liquid lead bromide

Iron is required for a variety of metabolic processes but is only present in low concentrations in the open ocean, and in many of these regions evidence suggests it is the most limiting nutrient for primary production. Draw the general pattern that you would expect for an open ocean vertical profile of iron to a depth of 3000 m, include with it a vertical profile for temperature and dissolved oxygen. Exact details are not required, the patterns are what are important, but attempt to include representatively correct maximum values for the Fe conc (in pmol/kg), O2 (in umol/kg), and temperature in degrees C.

1.Derive an expression for molar entropy of an equally spaced three-level system,
where the spacing ε.
2.Absorptions in the