Standard electrode potential for Sn⁴⁺ / Sn²⁺ couple is +0.15 V and that for the Cr³⁺/Cr  couple is -0.74. These two couples in their standard state are connected to make a cell. The cell potential will be

• +0.89 V

• +0.18 V

• +1.83 V

• +1.83 V

A solution contains Fe²⁺ Fe³⁺, and I^- ions. This solution was treated with iodine at 35^o C.E^o for Fe³⁺/ Fe²⁺ is +0.77 V and E^o for I₂/ 2 I^- = 0.536 V. The favourable redox reaction is 

• I₂ will be reduced to I^-

• There will be No redox reaction

• I^- will be oxidised to I₂

• I^- will be oxidised to I₂

In qualitative analysis, the metals of group I can be separted from other ions by precipitating them as chloride salts. A solution initially contains Ag⁺ and Pb²⁺ at a concentration of 0.10 M. Aqueous HCl is added to this solution until the Cl^- concentration is 0.10 M. What will be the concentration of Ag⁺ and Pb²⁺ be at equilibrium? (K_sp for AgCl = 1.8 x 10^-10, Ksp for PbCl₂  = 1.7 x 10^-5)

• [Ag⁺]  = 1.8 x 10^-7 M; [Pb²⁺] = 1.7 x 10^-6 M

• [Ag⁺]  = 1.8 x 10^-11 M; [Pb²⁺] = 8.5 x 10^-5 M

• [Ag⁺]  = 1.8 x 10^-9 M; [Pb²⁺] = 1.7 x 10^-3 M

• [Ag⁺]  = 1.8 x 10^-9 M; [Pb²⁺] = 1.7 x 10^-3 M

For the reaction of silver ions with copper metal, the standard cell potential was found to be +0.46 V at 25^o C^. The value of standard Gibbs energy, ΔG^o will be (F = 96500 C mol^-1 ) 

• -89.0 kJ

• -89.0 J

• -44.5 kJ

• -44.5 kJ

An increase in equivalent conductance of strong electrolyte with dilution is mainly due to

• the increase in ionic mobility of ions

• 100% ionisation of electrolyte at normal dilution

• the increase in both, ie, the number of ions and ionic mobility of ions

• the increase in both, ie, the number of ions and ionic mobility of ions

Which of the following expression correctly represents the equivalent conductance at infinite dilution of Al₂(SO₄)_3. Given that are the equivalent conductance at infinite dilution of the respective ions.

Consider the following relations for emf of an electrochemical cell

A) Emf of cell = (oxidation potential of anode) - (reduction potential of cathode)

B) Emf of cell = (oxidation potential of anode) - ( reducation potential of cathode)

C) Emf of cell = (oxidation potential of anode)- (reduction potential of cathode)

D) Emf of cell = (oxidation potential of anode) - (oxidation potential of anode)-(oxidation potential  of cathode)

• (C) and (A)

• (A) and (B)

• (C) and (D)

• (C) and (D)

268.

For vaporisation of water at 1 atm pressure, the values of ΔH and ΔS are 40.63 kJ mol^- and 108.8 JK^-1 mol^-1, respectively. The temperature when Gibbs energy change (ΔG) for this transformation will be zero, is

• 273.14 K

• 393.4 K 

• 373.4 K 

• 373.4 K 

Al₂O₃ is reduced by electrolysis at low potentials and high currents. If 4.5 x 10⁴ An of current is passed through molten Al₂O₃ for 6h, what mass of aluminium is produced? (Assume 100% current efficiency, at.mass of Al = 27 g mol^-1)

• 9.0 x 10³ g

• 8.1 x 10⁴ g

• 2.4 x 10⁵ g 

• 2.4 x 10⁵ g 

The equivalent conductance of M/32 solution of weak monobasic acid is 8.0 ohm-cm² and at infinite dilution is 400 ohm-cm². The dissociation constant of this acid is

• 1.25 x 10^-5

• 1.25 x 10^-6

• 6.25 x 10^-4

• 6.25 x 10^-4