19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The reduction potential at 25oC for Fe3+|Fe2+ electrode is +0.718 V. If , the ratio of molar concentrations of Fe2+ to Fe3+ ions in solution is (2.303RT/F = 0.06, log 5 = 0.7)
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)
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]
How many coulombs are required to deposit 50 g of aluminium when the electrode reaction is Al 3e Al -> [RPMT 2010]
The equivalent conductance of M / 32 solution of a weak monobasic acid is 8.0 mho cm2 eq–1and at infinite dilution is 400 mho cm2 eq–1. The dissociation constant of this acid is [CBSE AIPMT 2010]
The conductivity of 0.20 M KCl solution at 298 K is 0.0248 S cm–1. What will be molar conductivity? [Haryana PMT 2010] (a)124 S cm2 (b)124 S cm–1 (c)124 S ohm–1 cm2 equiv–1 (d)124 S cm2 mol–1
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?
Galvanic cell is a device in which
What is the cell reaction occurring in Daniell cell (Galvanic cell)? (a) Cu s ZnSO aq CuSO aq Zn s -> (b) Zn s CuSO aq Cu s ZnSO -> (c) Ni s ZnSO aq NiSO s Zn s -> (d) 2Na s CdSO aq Na SO aq…
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.
When iron is rusted, it is [MP PMT 2010]
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]
Assertion (A) On dilution, the equivalent as well as molar conductivity of solution increases. Reason (R) With dilution, the number of current carrying particles per cm3 increases. [AIIMS 2010]
Which of the following expressions correctly represents the equivalent conductance at infinite dilution of Al2(SO4)3, Given that o Al and o SO are the equivalent conductance at infinite dilution of the respective …
Standard electrode potential of cell is (EºAg+/Ag = 0.80V)
If the salt bridge is removed suddenly from a working cell, the voltage
Which one of the following is not a function of a salt bridge?
Which one of the following statements is incorrect regarding an electrochemical cell?