MCQOPTIONS
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MCQOPTIONS
This section includes 45 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry Mcqs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
If electricity is passed through CuSO4 solution by using Pt electrode then which of the following possible change occurs? |
| A. | H2 is deposited at cathode |
| B. | Colour of the solution becomes fade |
| C. | Cu is deposited at anode |
| D. | All are possible |
| Answer» C. Cu is deposited at anode | |
| 2. |
Which has maximum oxidation number? |
| A. | N |
| B. | Cr |
| C. | S |
| D. | Mn |
| Answer» E. | |
| 3. |
Which of the following element act as inert electrode |
| A. | Cu |
| B. | Ag |
| C. | Pt |
| D. | None |
| Answer» D. None | |
| 4. |
Which of the following cell is not rechargeable? |
| A. | Lead storage battery |
| B. | Silver oxide cell |
| C. | Fuel cell |
| D. | Ni-Cd cell |
| Answer» C. Fuel cell | |
| 5. |
Stronger the oxidizing agent greater is the |
| A. | Oxidation potential |
| B. | Reduction potential |
| C. | Redox potential |
| D. | Emf of cell |
| Answer» C. Redox potential | |
| 6. |
Which of the following is true in the case of Zn-Cu cell? |
| A. | The flow of electrons takes place from copper to zinc |
| B. | E0red of copper electrode is less than that of zinc electrode |
| C. | Zinc acts as an anode and copper as cathode |
| D. | All are correct |
| Answer» D. All are correct | |
| 7. |
In a galvanic cell |
| A. | Chemical energy is converted into electricity |
| B. | Chemical energy is converted into heat |
| C. | Electrical energy is converted into chemical energy |
| D. | Electrical energy is converted into heat |
| Answer» B. Chemical energy is converted into heat | |
| 8. |
The degree of dissociation of week electrolyte increases as |
| A. | Pressure increases |
| B. | Dilution decreases |
| C. | Dilution increases |
| D. | None |
| Answer» D. None | |
| 9. |
In an electrolytic cell cathode provides electrons to |
| A. | Ve ion |
| B. | ?ve ion |
| C. | Neutral atom |
| D. | Does not provide any electron |
| Answer» B. ?ve ion | |
| 10. |
In Galvanic cell electrons flow from anode to cathode through |
| A. | External electric circuit |
| B. | Salt bridge |
| C. | Movement of ions |
| D. | All of the above |
| Answer» B. Salt bridge | |
| 11. |
Decrease in oxidation number is called |
| A. | Oxidation |
| B. | Reduction |
| C. | Oxidation-reduction |
| D. | All of above represent same entity |
| Answer» C. Oxidation-reduction | |
| 12. |
For the measurement of standard electrode potential Zn is dipped in |
| A. | 1 M ZnO solution |
| B. | 1 M ZnSO4 solution |
| C. | 1.5 M ZnSO4 solution |
| D. | 0.1 M ZnSO4 solution |
| Answer» C. 1.5 M ZnSO4 solution | |
| 13. |
Right half cell contains __________ electrode |
| A. | A1 |
| B. | Zn |
| C. | Cu |
| D. | Fe |
| Answer» D. Fe | |
| 14. |
Zn(s)/Zn+2(aq) 1M | | Cu+2(aq) 1M/Cu(s) is representation of reaction in |
| A. | Daniel cell |
| B. | Downs cell |
| C. | Voltaic cell |
| D. | Nelsons cell |
| Answer» D. Nelsons cell | |
| 15. |
Salt bridge transfers |
| A. | Electrons |
| B. | Anion |
| C. | Current |
| D. | Ions |
| Answer» E. | |
| 16. |
Voltaic cell can be recharged by |
| A. | By addition of fresh solution |
| B. | By replacing external circuit with external source of electricity |
| C. | By removal of solution |
| D. | By heating it |
| Answer» C. By removal of solution | |
| 17. |
E0red of an element cab be calculated by comparing it with |
| A. | New electrode of same element |
| B. | SHE |
| C. | 1M solution of ions of respective element |
| D. | 2M solution of HCI |
| Answer» C. 1M solution of ions of respective element | |
| 18. |
Temperature for the measurement of standard electrode potential is |
| A. | 298K |
| B. | 300K |
| C. | 30?C |
| D. | 310K |
| Answer» B. 300K | |
| 19. |
H2 gas in SHE is filled at pressure of |
| A. | 760mm of Hg |
| B. | 750mm of Hg |
| C. | 780mm of Hg |
| D. | 800mm of Hg |
| Answer» B. 750mm of Hg | |
| 20. |
Potential of SHE is considered as |
| A. | Zero |
| B. | Unity |
| C. | Constant |
| D. | Multiple of 1 |
| Answer» B. Unity | |
| 21. |
Chemical used in salt bridge is |
| A. | KOH |
| B. | KCI |
| C. | KNO3 |
| D. | KBr |
| Answer» C. KNO3 | |
| 22. |
Electrode potential of Zn is |
| A. | Oxidation |
| B. | Reduction |
| C. | Oxidation-reduction |
| D. | Depends on the nature of the coupled electrode |
| Answer» E. | |
| 23. |
List of elements based on hydrogen scale is called |
| A. | Periodic table |
| B. | Groups |
| C. | Periods |
| D. | Electrochemical series |
| Answer» E. | |
| 24. |
Molten NaCl conducts electricity due to the presence of |
| A. | Free electrons |
| B. | Free molecules |
| C. | Free ions |
| D. | Atoms of Na and Cl |
| Answer» D. Atoms of Na and Cl | |
| 25. |
In which of the following reactions occur at cathode? |
| A. | Cu2++2e-? Cu |
| B. | Cu+2e-? Cu2+ |
| C. | Hg + O2 ? HgO |
| D. | Mg + O2 ? MgO |
| Answer» B. Cu+2e-? Cu2+ | |
| 26. |
Electricity in voltaic cell is produced due to |
| A. | Neutralization |
| B. | Oxidation |
| C. | Reduction |
| D. | Both b & c |
| Answer» E. | |
| 27. |
In electrolytic solution conductance of electricity is due to |
| A. | Free electrons |
| B. | Ions |
| C. | Metals |
| D. | Electrodes |
| Answer» C. Metals | |
| 28. |
In electrolytic cell electricity carries |
| A. | Spontaneous reaction |
| B. | Non-wpontaneous reaction |
| C. | Neutralization |
| D. | All of above |
| Answer» C. Neutralization | |
| 29. |
Reaction at anode is called |
| A. | Oxidation |
| B. | Reduction |
| C. | Redox |
| D. | Decomposition |
| Answer» B. Reduction | |
| 30. |
The half cells are interconnected through |
| A. | Wire |
| B. | Salt bridge |
| C. | Electric circuit |
| D. | No connection exists |
| Answer» C. Electric circuit | |
| 31. |
Secondary cell is |
| A. | Rechargeable |
| B. | Non rechargeable |
| C. | Electrolytic cell |
| D. | Daniel cell |
| Answer» B. Non rechargeable | |
| 32. |
The element that act as anode always have _______ position in electrochemical cell |
| A. | Higher |
| B. | Lower |
| C. | In middle |
| D. | No effect of position |
| Answer» B. Lower | |
| 33. |
In galvanic cell Zn acts as an anode so its value of standard reduction potential in comparison to coupled electrode would be |
| A. | Greater |
| B. | Lesser |
| C. | Sum of reduction and oxidation potentials |
| D. | None |
| Answer» B. Lesser | |
| 34. |
Greater value of standard reduction potential greater will be tendency |
| A. | To get oxidized |
| B. | To get reduced |
| C. | To accept electrons |
| D. | Both b and c |
| Answer» E. | |
| 35. |
Greater value of standard reduction potential smaller will be tendency |
| A. | To form positive ions |
| B. | To form negative ions |
| C. | Gain electrons |
| D. | All are possible |
| Answer» B. To form negative ions | |
| 36. |
Lead accumulators are |
| A. | Secondary cell |
| B. | Primary cell |
| C. | Voltaic cell |
| D. | Both a & c |
| Answer» E. | |
| 37. |
Capacity of one lead accumulator cell is |
| A. | 1.5 volts |
| B. | 2 volts |
| C. | 3 volts |
| D. | 1 volts |
| Answer» C. 3 volts | |
| 38. |
The strength of solution of an element whose electrode potential is to be measured is |
| A. | 2M |
| B. | 1N |
| C. | 1m |
| D. | 1M |
| Answer» E. | |
| 39. |
In alkaline battery the anode is made up of |
| A. | MnO2 |
| B. | Zn |
| C. | AgO2 |
| D. | Cadmium |
| Answer» C. AgO2 | |
| 40. |
Density of H2SO4 in lead accumulator is |
| A. | 1.25g/cm3 |
| B. | 1.3g/cm3 |
| C. | 1.20g/cm3 |
| D. | 1.15g/cm3 |
| Answer» B. 1.3g/cm3 | |
| 41. |
In K2Cr2O7 the oxidation number of chromium is |
| A. | 7 |
| B. | 6 |
| C. | -7 |
| D. | -6 |
| Answer» C. -7 | |
| 42. |
Apparent charge on atom in molecule is |
| A. | Valency |
| B. | Coordination number |
| C. | Oxidation number |
| D. | Charge number |
| Answer» D. Charge number | |
| 43. |
Voltaic cell is a |
| A. | Irreversible cell |
| B. | Reversible cell |
| C. | Alkaline cell |
| D. | All of the above |
| Answer» E. | |
| 44. |
Percentage of sulphuric acid in lead accumulator is |
| A. | 40% |
| B. | 25% |
| C. | 30% |
| D. | 50% |
| Answer» D. 50% | |
| 45. |
The reduction potential Zn is |
| A. | 0.76 |
| B. | -0.76 |
| C. | -0.55 |
| D. | 0.55 |
| Answer» C. -0.55 | |