Electrochemistry Test - 10

Calculate the useful work of the reaction Ag(s) + 1/2Cl₂ (g) → AgCl(s)
Given  E °_cl2/cl-  = + 1.36 V,    E °_AgCl/Ag,Cl-  = 0.22 V

If     P_cl2   = 1 atm   and T = 298 K

Which of these ions Cu⁺ , Co³⁺ , Fe²⁺  is stable in aqueous medium.

Given :

E ° _{Cu²⁺ /Cu⁺}  = 0.15 volt ;       E ° _{Cu⁺ /Cu}  = 0.53 V ;    E ° _{Co³⁺ /Co²⁺}  = 1.82 V ;

E ° _{Fe³⁺ /Fe²⁺}  = 0.77 V ;  E ° _{Fe²⁺ Fe}  = - 0.44 V ;   E ° _{O² ,H⁺ /H² O}  = 1.23 V

Select the correct statement if -

E ° _{Mg²⁺ /Mg}  = - 2.4V,    E ° _{Sn⁴⁺ /Sn²⁺}  = 0.1 V,   E ° _{MnO^4- ,H⁺ /Mn²⁺}  = 1.5 V, E °  _{I² /I^-}  = 0.5 V   Here,

 What is the value of pK_b (CH₃ COOH^- ) if λ_m^∞  = 390 &λ_m  = 7.8 for 0.04 of a CH3COOH at 25 °C           

The temperature coefficient of a standard Cd-cell is –5.0X10^–5 Vk^–1 whose emf at 25 °C is 1.018 V. During the cell operation, the temperature will -           

 A cell Ag | Ag⁺ || Cu⁺⁺ | Cu initially contains 2M Ag⁺ and 2M Cu⁺⁺ ions. The charger in cell potential after the passage of 10 amp current for 4825 sec is:          

For the cell (at 298 K)

Ag(s) | AgCl(s) | Cl^- (aq) || AgNO₃ (aq) | Ag(s)

Which of the following is correct –

During an electrolysis of conc. H₂ SO₄ , perdissulphuric acid (H₂ S₂ O₈ ) and O₂ from in equimolar amount. The amount of H₂ that will form simultaneously will be (2H₂ SO4 →H₂ S₂ O₈ + 2H⁺ + 2e^- )

Statement-1:  In electrochemical cell, we cannot use KCI in the salt bridge if anodic  or cathodic compartment consists of Ag⁺  of Pb²⁺  ion.

Statement-2:  Salt bridge is employed to maintain the electrical neutrality and to minimize the liquid-liquid junction potential.

Statement-1: Zinc protect the iron better than tin even after it cracks.

Statement-2: E°_OPzn < E°_OPfe But E°_OPSn > E°_OPfe