Chemistry questions
29404 published questions with worked solutions.
- E^ Cu/Cu^ +2 = +0.34 V, E^ Sn/Sn^ +2 = -0.14 V, E^ Zn/Zn^ 2+ = -0.76 V. Predict spontaneous reaction.
- E^ Cu/Cu^ +2 = +0.34 V, E^ Sn/Sn^ +2 = -0.14 V, E^ Zn/Zn^ 2+ = -0.76 V. Predict spontaneous reaction.
- Prevention of corrosion on iron by Zn coating is called
- Is the reaction 2Al + 3Fe^ 2+ → 2Al^ 3+ + 3Fe possible?
- Following reaction occur spontaneously as written below : 2Fe^ 3+ + 2I^- → 2Fe^ 2+ + I_2 O_2(g) + 4H^+ + 4Fe^ 2+ → 4Fe^ 3+ +...
- Zinc is used to protect corrosion of iron because
- Four elements , A, B, C and D have standard oxidation potential values at : 2.87 V; +2.71 V; 1.67 V and -2.87 V. The strongest...
- Arrange the following metals in the increasing order of reducing power: Li, Zn, Sn, Fe, Cu, Ag. E^ _ Li = -3.045 V, E^ _ Zn =...
- Which of the following pairs of metal cannot be obtained by electrolysis of an aqueous solution of its salt?
- Given that E^ (Zn) = -0.76 V and E^ (Cu) = 0.34 V. Calculate the emf of the cell with cell reaction Zn + Cu^ 2+ → Cu + Zn^ 2+ .
- The standard oxidation potentials of the elements M_1, M_2 and M_3 are +0.34 V, +3.05 V and +1.66 V respectively. The order of...
- The reaction is spontaneous if the cell potential is
- What metal will dissolve in the galvanic cell represented as : Cu | Cu^ 2+ || Ag^+ | Ag?
- In the cell, Pt, Sn^ +2 | Sn^ +4 || Fe^ +3 | Fe^ +2 , Pt, the cathode half cell reaction is
- Given that E^ (Zn) = -0.76 V and E^ (Mg | Mg^ 2+ ) = 2.37 V. What will happen when zinc dust is added to MgCl_2 solution?
- E^ for Fe^ 2+ + 2e^- → Fe is -0.4 volts and E^ for Zn^ 2+ + 2e^- → Zn is -0.76 volts. It means that
- Which of the following metals will be deposited first when a solution containing 0.1 mol/litre of each of AgNO_3, Ca(NO_3) and...
- Standard zinc electrode is coupled with a standard electrode to form a cell, whose emf was found to be 1.60 V, reduction taking...
- In emf series, elements are arranged in the
- The standard reduction potential of silver, chlorine, gold and copper are +0.80 V, +1.36 V, +1.42 V, +0.34 V respectively. The...