15. At pH = 2, Equinhydrone = 1.30 V, Equinhydrone will be: ОН + 2H+ + 2e ОН (а) 1.36 у (c) 1.42 V (b) 1.30 V (d) 1.20 V

At pH=2,E_("Quinhydrone")^@ =1.30V,E_("Quinhydrone") will be:

At pH = 2, E_(("Quinhydrone"))^(@) = 1.30 V, E_("Quinhydrone") will be :

At pH = 2, E_(("Quinhydrone"))^(@) = 1.30 V, E_("Quinhydrone") will be :

The standard EMF of quinhydrone is 0.699V . The EMF of the quinhydrone electrode dipped in a solution with pH=10 is (a) 0.109V (b) -0.109V (c) 1.289V (d) -1.289V

Consider the following cell reation : 2Fe(s)+O_(2)(g)+4H^(o+)(aq) rarr 2Fe^(2+)(aq)+2H_(2)O(l)" "E^(c-)=1.67V At[Fe^(2+)]=10^(-3)M,p(O_(2))=0.1atm and pH=3 . The cell potential at 25^(@)C is (a) 1.47V (b) 1.77V (c) 1.87V (d) 1.57V

In the circuit, the battery is ideal. A voltmeter of inifinite resistance is connected in turn across R_1 and R_2 , giving reading of V_1 and V_2 respectively. . (i) V_1 = 80 V (ii) V_1 = 60 V (iii) V_2 = 30 V (iv) V_2 = 40 V .

The standard reduction potential for half reactions for four different elements. A, B, C and D are: (i) A_(2) + 2e^(-) rarr 2A^(-), E^(@) = + 2.85 V (ii) B_(2) + 2e^(-) rarr 2B^(-), E^(@) = + 1.36 V (iii) C_(2) + 2e^(-) rarr 2C^(-), E^(@) = + 1.06 V (iv) D_(2) + 2e^(-) rarr 2D^(-), E^(@) = + 0.53 V The strongest oxidising reducing agents smong these :

(V + 1) / (V (2V + 1)) dv = - (1) / (x) dx