HARD
JEE Main
IMPORTANT
Earn 100

108 g of silver (molar mass 108 gmol-1) is deposited at cathode from AgNO3aq solution by a certain quantity of electricity. The volume (in L) of oxygen gas produced at 273 K and 1 bar pressure from water by the same quantity of electricity is x10. Value of 'x' to the nearest integer is _____.

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Important Questions on Electrochemistry

MEDIUM
JEE Main
IMPORTANT
If the standard electrode potential for a cell is 2 V at 300 K, the equilibrium constant K for the reaction.

Zns+Cu2+aqZn2+aq+Cus 

at 300 K is approximately:

R=8 JK-1mol-1, F=96000 C mol-1
MEDIUM
JEE Main
IMPORTANT
The anodic half-cell of lead-acid battery is recharged using electricity of 0.05 Faraday. The amount of PbSO4  electrolyzed in g during the process is: (Molar mass of PbSO4=303g mol-1)
EASY
JEE Main
IMPORTANT
A solution of NiNO32 is electrolyzed between platinum electrode 0.1 Faraday electricity. How many mole of Ni will be deposited at the cathode?
EASY
JEE Main
IMPORTANT
The standard Gibbs energy for the given cell reaction in kJ mol-1 at 298 K is:
Zns+Cu2+aqZn2+aq+Cu(s) ,
E0=2 V at 298 K
(Faraday's constant ,F=96000 C mol-1)
EASY
JEE Main
IMPORTANT
Which of the following ions does not liberate hydrogen gas on reaction with dilute acids?
MEDIUM
JEE Main
IMPORTANT
To find the standard potential of M3+/M electrode, the following cell is constituted: Pt/M/M3+ 0.001 mol L-1/Ag+ 0.01 mol L-1/Ag

The emf of the cell is found to be 0.421 volt at 298 K. The standard potential of half-reaction M3++3e-M at 298 K will be:

(Given: EAg+Ag at 298 K=0.80 volt)
MEDIUM
JEE Main
IMPORTANT

A current of 10.0 A flows for 2.00 h through an electrolytic cell containing a molten salt of metal X. This results in the decomposition of 0.250 mol of metal X at the cathode. The oxidation state of X in the molten salt is:

F=96,500 C

EASY
JEE Main
IMPORTANT
The standard electrode potentials E M + / M o  of four metals A,B,C and D are 1.2V, 0.6V 0.85V and 0.76V , respectively. The sequence of deposition of metals on applying potential is