19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Two students use same stock solution of ZnSO4 but different solutions of CuSO4. The EMF of one cell is 0.03 V higher than the other. The concentration of CuSO4 in the cell with higher EMF value is 0.5 M. The concentra…
The e.m.f. of a Daniell cell at 298K is When the concentration of ZnSO4 is 1.0 M and that of CuSO4 is 0.01 M, the e.m.f. changed to E2. What is the relationship between E1 and E2?
On the basis of information available from the reaction 4Al + 3O2 →2Al2O3; ∆G = – 965 kJ/mol of O2.The minimum EMF required to carry out electrolysis of Al2O3 is
A 1.0 M with respect to each of the metal halide AX3, BX2 CX3 and DX2 is electrolysed using platinum electrodes. If The correct sequence in which the various metals are deposited at the cathode is
Assertion: Zinc can be used while copper cannot be used in the recovery of Ag from the complex [Ag(CN)2]– Reason: Zinc is powerful reducing agent than copper.
Cr O 14H 6e 2Cr 7H O; -> E 1.33V. At [Cr O ]l 4.5 millimoles, [Cr3+] = 15 millimoles, E is 1.067 V. The pH of the solution is nearly equal to [KCET 2016]
Standard electrode potential for Sn4+/Sn2+ couple is +0.15 V and that for the Cr3+/Cr couple is –0.74V. These two couples in their standard state are connected to make a cell. The cell potential will be: [AIPMT 2011]
Which one of the following is not a function of a salt bridge?
How many coulombs are required to deposit 50 g of aluminium when the electrode reaction is Al 3e Al -> [RPMT 2010]
For the process: Cu2+ + 2e– → Cu; log[Cu2+] vs. Ered graph is shown in the figure, where OA = 0.34 V. The electrode potential of the half-cell of Cu|Cu2+ (0.1 M) will be [2.303 RT/F = 0.06]
Which graph correctly correlates Ecell as a function of concentrations for the cell Zn(s) + 2Ag+(aq) Zn2+(aq) + 2Ag(s), E°cell = 1.56 V Y-axis : Ecell, X-axis : log10 (a) (b) (c) (d)
The e.m.f. of a Daniell cell at 298K is When the concentration of ZnSO4 is 1.0 M and that of CuSO4 is 0.01 M, the e.m.f. changed to E2. What is the relationship between E1 and E2?
On the basis of information available from the reaction 4Al + 3O2 →2Al2O3; ∆G = – 965 kJ/mol of O2.The minimum EMF required to carry out electrolysis of Al2O3 is
A 1.0 M with respect to each of the metal halide AX3, BX2 CX3 and DX2 is electrolysed using platinum electrodes. If The correct sequence in which the various metals are deposited at the cathode is
Assertion: Zinc can be used while copper cannot be used in the recovery of Ag from the complex [Ag(CN)2]– Reason: Zinc is powerful reducing agent than copper.
Cr O 14H 6e 2Cr 7H O; -> E 1.33V. At [Cr O ]l 4.5 millimoles, [Cr3+] = 15 millimoles, E is 1.067 V. The pH of the solution is nearly equal to [KCET 2016]
Standard electrode potential for Sn4+/Sn2+ couple is +0.15 V and that for the Cr3+/Cr couple is –0.74V. These two couples in their standard state are connected to make a cell. The cell potential will be: [AIPMT 2011]
For the reduction of silver ions with copper metal, the standard cell potential was found to be +0.46 V at 25ºC. The value of standard Gibbs energy, ∆Gº will be (F = 96500 C mol–1) [CBSE AIPMT 2010]
Which one of the following is not a function of a salt bridge?
Standard solution of KNO3 is used to make salt bridge because
Which of the following has been universally accepted as a reference electrode at all temperatures and has been assigned a value of zero volts?
The electrochemical cell stops working after some time because
Which one of the following statements is incorrect regarding an electrochemical cell?
At 18º C, the conductance of H+ and CH3COO– at infinite dilution are 315 and 35 mho cn2 eq–1 respectively. The equivalent conductivity of CH3 COOH at infinite dilution is…..mho cm2 eq–1 [CBSE AIPMT 2010]
Two students use same stock solution of ZnSO4 but different solutions of CuSO4. The EMF of one cell is 0.03 V higher than the other. The concentration of CuSO4 in the cell with higher EMF value is 0.5 M. The concentra…