General
✓✗Which of the following will NOT react under standard conditions? (E°: Mg2+/Mg −2.37, Fe2+/Fe −0.44, Cu2+/Cu +0.34, Ag+/Ag +0.80 V)
- Fe + Cu2+
- Fe + Ag+
- Cu + Fe2+
- Mg + Cu2+
General
✓✗The reaction Zn + 2HCl → ZnCl2 + H2 is an example of
- a non-redox reaction
- a combination reaction
- a hydrogen displacement reaction
- a disproportionation reaction
General
✓✗The oxidation number of N in NH3 is
- +3
- +5
- 0
- −3
General
✓✗Statement I: In the ion-electron method, the two half-reactions are multiplied so that the electrons lost equal the electrons gained.
Statement II: A balanced redox equation must be balanced for both atoms and charge.
Statement II: A balanced redox equation must be balanced for both atoms and charge.
- Both Statement I and Statement II are correct
- Both Statement I and Statement II are incorrect
- Statement I is correct but Statement II is incorrect
- Statement I is incorrect but Statement II is correct
General
✓✗The oxidation number of C in HCHO (methanal) is
- +2
- −2
- 0
- +4
General
✓✗An oxidising agent is a substance that
- donates electrons and is itself oxidised
- accepts electrons and is itself reduced
- always contains oxygen
- always contains hydrogen
General
✓✗The volume of 0.1 M Na2S2O3 needed to react with 0.01 mol of I2 is
- 200 mL
- 20 mL
- 50 mL
- 100 mL
General
✓✗Which of the following is a disproportionation reaction?
- 2H2O2 → 2H2O + O2
- CaCO3 → CaO + CO2
- 2Mg + O2 → 2MgO
- Zn + CuSO4 → ZnSO4 + Cu
General
✓✗A copper rod is dipped in silver nitrate solution. Which of the following happens?
- No reaction occurs
- Oxygen is evolved
- Silver dissolves and copper is deposited
- Copper dissolves and silver is deposited
General
✓✗For the reaction 3MnO42− + 4H+ → 2MnO4− + MnO2 + 2H2O, which of the following oxidation states are NOT shown by Mn in the given species?
A. +6
B. +2
C. +4
D. +7
E. +3
Choose the most appropriate answer from the options given below.
A. +6
B. +2
C. +4
D. +7
E. +3
Choose the most appropriate answer from the options given below.
- B and E only
- A and B only
- D and E only
- B and D only
General
✓✗Which of the following cannot be oxidised further?
- NO2
- CO
- CO2
- SO2
General
✓✗The oxidation number of each S atom in the peroxodisulphate ion S2O82− is
- +7
- +6
- +3.5
- +5
General
✓✗In basic medium, the reaction 2ClO2 + H2O2 + 2OH− → 2ClO2− + O2 + 2H2O takes place. The role of H2O2 in this reaction is
- catalyst
- oxidising agent
- base only
- reducing agent
General
✓✗The standard hydrogen electrode (SHE) is assigned a standard electrode potential of
- −0.76 V
- 1.00 V
- 0.00 V
- +0.34 V
General
✓✗In the balanced equation 2MnO4− + 5SO32− + 6H+ → 2Mn2+ + 5SO42− + xH2O, the value of x is
- 6
- 2
- 4
- 3