The number of incorrect statements from the following is _____
A.The electrical work that a reaction can perform at constant pressure and temperature is equal to the reaction of Gibbs energy.
B.`E_(cell)^(theta)` is dependent on the pressure
C. `(dE_(cell)^(theta))/(dT)=(Delta_r S^(theta))/(nF)`
D.A cell is opening reversibly if the cell potential is exactly balanced by an opposing source of potential difference.

Consider the following electrochemical cell. (a). Write a balanced net ionic equation for the spontaneous reaction that take place in the cell. (b). Calculate the standard cell potential E^(0) for the cell reaction. (c). If the cell emf is 1.6V what is the concentration of Zn^(2+) ? (d). How will the cell potential be affected if Kl is added to Ag^(+) half-cell?

Mark out the number of incorrect statement/s: [I] Some essential elements can alter the osmotic potential of a cell. [II] Nitrogen is required by the meristematic tissue and the metabolically active cells only. [III] Mg^(2+) is needed by several respiratory enzymes. [IV] Mo is essential for the water-splitting reaction in photosynthsis, a reaction that leads to oxygen evolution. [V] Sulphur is the main constituent of several coenzymes, vitamins (thiamine, biotin, coenzyme-A) and ferrodoxin.

A fuel cell is a cell that is continously supplied with an oxidant and a reductant so that if can deliver a current indefinitely. Fuel cells offer the possibility of achieving high thermodynamic efficiency in the conversion of Gibbs energy into mechanical work.Internal combustion engines at best convert only the fraction (T_2-T_1)//T_2 of the heat of combustion into mechanical work. While the thermodynamic efficiency of the fuel cell is given by, eta=(DeltaG)/(DeltaH) , where DeltaG is the Gibbs energy change for the cell reaction and DeltaH is the enthalpy change of the cell reaction.A hydrogen-oxygen fuel cell may have an acidic or alkaline electrolyte. Pt|H_2(g)|H^(+)(aq.)||H_2O(l)|O_(2)(g)|Pt , (2.303 RT)/F=0.06 The above fuel cell is used to produce constant current supply under constant temperature & 30 atm constant total pressure conditions in a cylinder.If 10 moles H_2 and 5 moles of O_2 were taken initially. Rate of consumption of O_2 is 10 milli moles per minute. The half-cell reactions are 1/2O_2(g)+2H^+(aq)+2e^(-)toH_2O(l) E^(@)=1.246 V 2H^+(aq)+2e^(-) to H_2(g) E^(@)=0 To maximize the power per unit mass of an electrochemical cell, the electronic and electrolytic resistances of the cell must be minimized.Since fused salts have lower electolytic resistances than aqueous solutions, high-temperature electrochemical cells are of special interest for practical applications. Calculate e.m.f of the given cell at t=0.(log 2=0.3)

In following diagram boxes may contain resistor or barrery or any other element then determine in each case (a) E.M.f. of battery (b) Battery is acting as a source or load ( c) Potential difference across each battery (d) Power input to the battery or output by tthe battery. ( e) The rate at which heat is generated inside the battery. (f) The rate at which the chemical energy of the cell is consumed or increased. (g) Potential differnce across box (h) Electric power output across box.