the decrease in the value of emf of an unsaturated weston cell is about(a) 1µv per year(b) 1 mv per year(c) 5-10 µv per year(d) 30-50 µv per year

At 298K, the EMF of the cell: Mg(s) |Mg2+(Q)||Ag+(0.01)|Ag(s)is 3.022V. Calculate the value ‘Q’.(Given: EoMg2+/Mg = -2.37V and EoAg+/Ag = 0.80V)

The emf of the cell,               Tl(s) | Tl+(aq) (0.0001 M) || Cu2+(aq) (0.01M) | Cu(s) is 0.83 V                The emf of this cell will be increased by :–Increasing the concentration of Cu2+ ionsDecreasing the concentration of Tl+Increasing the concentration of both(A) & (B) both

A cell is connected to an ideal voltmeter, a switch S and a resistor R. The resistanceof R is 4.0 Ω.VRS 4.0 ΩWhen S is open the reading on the voltmeter is 12 V. When S is closed the voltmeterreads 8.0 V.(i) State the emf of the cell.

For what concentration of Ag+(aq). will the emf of given cell be zero at 25 °C . if the concentration ofCu(s) I Cu2+ (0.1M) II Aa+(aq.)1Ag(s)? Given. E° Ag+/Ag = 0.80V: E° Cu2+/Cu = 0.34V.

For the electrochemical cell Ca(s) + Ca2+(aq, 1​M)∥Cu2+(aq, 1​M)  ∣  Cu(s) The standard emf of the cell is 3.20 V at 300 K. When the concentration of Ca2+ is changed to x M, the cell potential changes to 3.185 V at 300 K. The value of 100x is__________.[Given:  FR  =  11500​KV−1, where F is the Faraday constant and R is the gas constant,  ℓn​3.15  =  1.15]