In electrolysis of NaCl when Pt electrode is taken then H2 is liberated at cathode while with Hg cathode it forms sodium amalgam because
Hg is more inert than Pt
More voltage is required to reduce H+ at Hg than at Pt
Concentration of H+ ions is larger when Pt electrode is taken
Electrical __________ in one second is equal to electrical potential multiplied by total charge passed.
Energy
Work done
Heat
Circulation
______________ equation is used to calculate the cell potential.
Bragg's
Ideal gas
Nernst
Solution
The standard emf of a galvanic cell involving cell reaction with n = 2 is found to be 0.295 V at 25oC. The equilibrium constant of the reaction would be
(Given F = 96500 C mol-1; R = 8.314 JK-1 mol-1)
2.0 × 1011
4.0 × 1012
1.0 × 102
1.0 × 1010
_________ equation shows the relation between the Gibbs energy of the reaction and the emf of the cell.
ΔrG = nFE
ΔrG = -nFE
ΔrG = nF Kc
ΔrG = -nF Kc
Standard reduction potentials at 25oC of Li+ / Li, Ba2+ / Ba, Na+ / Na and Mg2+ / Mg are -3.05, -2.90, -2.71 and -2.37 volt respectively. Which one of the following is the strongest oxidising agent?
Mg2+
Ba2+
Na+
Li+
______ gas is the strongest oxidising agent.
Oxygen
Hydrogen
Fluorine
Nitrogen
If the standard electrode potential of an electrode is __________, then its reduced from is more stable compared to hydrogen gas.
Zero
Less than zero
Unit
Greater than zero
Equivalent conductance of NaCl, HCl and C2H5COONa at infinite dilution are 126.45, 426.16 and 91 ohm-1 cm2, respectively. The equivalent conductance of C2H5COOH is
201.28 ohm-1 cm2
390.71 ohm-1 cm2
698.28 ohm-1 cm2
540.48 ohm-1 cm2
___________ ion is the weakest oxidising agent.
Lithium
Oxide
