19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
When metallic copper is shaken with a solution of a copper salt, the reaction proceeds. When equilibrium is established at 298 K, [Cu2+]/[Cu+]2 = 1.667 × 106 M–1. If the standard potential of the Cu2+ | Cu half-cell i…
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 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)
Which cell converts electrical energy into chemical energy?
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…
Galvanic cell is a device in which
Which one of the following statements is incorrect regarding an electrochemical cell?
The electrochemical cell stops working after some time 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?
Standard solution of KNO3 is used to make salt bridge because
Which one of the following is not a function of a salt bridge?
If the salt bridge is removed suddenly from a working cell, the voltage
Standard electrode potential of cell is (EºAg+/Ag = 0.80V)
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 …
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]
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]
When iron is rusted, it is [MP PMT 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
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]
How many coulombs are required to deposit 50 g of aluminium when the electrode reaction is Al 3e Al -> [RPMT 2010]
Assertion : The melting point of Mn is more than that of Fe. Reason : Mn has higher number of unpaired e– than Fe in atomic state.
Which one of the following ions exhibits d-d transition and paramagnetic as well? (NEET 2018)
The manganate and permanganate ions are tetrahedral, due to: (NEET 2019)
When neutral or faintly alkaline KMnO4 is treated with potassium iodide, iodide ion is converted into ‘X’. ‘X’ is (Odisha NEET 2019)
The calculated spin only magnetic moment o 2+ Cr ion is : (NEET 2020)