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- 1. Multiple ChoiceHeat is absorbed when NaCl dissolves in water. Which enthalpies are involved in the solubility of this compound?Hydration energy & Lattice energyElectron affinity & Ionisation energy
- 2. Multiple ChoiceAn electrochemical cell was set up using iron and copper plates in molar solution of Fe2+ (aq) and Cu2+ respectively. Which one is the correct cell diagram represent?Fe (s) | Fe2+ (aq) || Cu2+ (aq) | Cu (s)Cu (s) | Cu2+ (aq) || Fe2+ (aq) | Fe (s)
- 3. Multiple ChoiceWhich simple covalent molecule has the highest standard enthalpy of atomisation?N2NOO2O3
- 4. Multiple ChoiceThe standard reduction potential, E°, at 298K for five half-cells are given below.<br />W2+ (aq) + 2e- <=> W (s) -2.38V<br />X3+ (aq) + 3e- <=> X (s) -1.66V<br />Y2+ (aq) +2e- <=> Y (s) +0.34V<br />Z+ (aq) + e- <=> Z (s) +0.80V<br />Fe2+ (aq) + 2e- <=> Fe (s) -0.44V<br /><br />Which species causes iron to rust faster?<br />Z+W2+X3+Y2+
- 5. Multiple ChoiceThe standard reduction potential of several half-cell reactions are shown below.<br /><br />Sn2+ (aq) + 2e- -> Sn (s) -0.14V<br />Fe2+ (aq) + 2e- -> Fe (s) -0.44V<br />Cr3+ (aq) + 3e- -> Cr (s) -0.74V<br />Mn2+ (aq) + 2e- -> Mn (s) -1.18V<br />Al3+ (aq) + 3e- -> Al (s) -1.66V<br /><br />Which metal will produce the most rust when it comes in contact with iron in an electrolyte?SnAlCrMn
- 6. Multiple ChoiceThe standard reduction potential for several half-cells at 298K are given.<br /><br />Al3+ = -1.66v,<br /><br />Fe2+ = -0.44v,<br /><br />Sn2+ = -0.14v,<br /><br />Cu2+ = +0.34v,<br /><br />I2 = +0.54,<br /><br />Fe3+ = +0.77,<br /><br />Br2 = +1.07,<br /><br />Cl2 = +1.36,<br /><br />Mn3+ = +1.49.<br /><br />Which species is the most powerful oxidising agent?Mn3+Al3+Cu2+Sn2+
- 7. Multiple ChoiceIron is protected from corrosion when in contact with aluminium but it corrodes more rapidly when contact with tin. Why?Aluminium is a stronger reducing agent than ironTin is a stronger reducing agent than iron
- 8. Multiple ChoiceBy write the electronic configuration of Fe2+ and Fe3+ ions. Which one is more stable between Fe2+ and Fe3+ ions?Fe3+ ion is more stable because of the 3d subshell is half-filledFe2+ ion is more stable because of the 3d subshell is half-filledFe3+ ion is more stable because occupied by two electrons that electrostatic repulsionFe2+ ion is more stable because occupied by two electrons that electrostatic repulsion
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