CONFIDENTIAL Page 6 of 12 INC2510 Sep/Nov 2021 Question 3: For the following reaction, answer the questions below: H+ +

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Confidential Page 6 Of 12 Inc2510 Sep Nov 2021 Question 3 For The Following Reaction Answer The Questions Below H 1 (125.74 KiB) Viewed 8 times

CONFIDENTIAL Page 6 of 12 INC2510 Sep/Nov 2021 Question 3: For the following reaction, answer the questions below: H+ + CoBr2 + Cr2O72- → CoBr3 + Cr3+ + H2O a) (i) Give the unbalanced oxidation half-reaction. (ii) Give the unbalanced reduction half-reaction. 2 marks b) You are given the following steps for balanced half reaction: Cr2O72- → Cr3+ Cr2O72- → Cr3+ + 7H2O 14H+ + Cr2O72- → Cr3+ + 7H2O 14H+ + Cr2O72- → Cr3+ + 7H2O + 7e List 3 problems that you see in the balancing of this half reaction and indicate what the correct balanced half reaction is. 6 marks c) Give the balanced half reaction that is not shown above. 4 marks d) Write the electron configuration of the Co ion in CoBr3. 2 marks [14] Question 4: a) Use the following empty molecular orbital diagram: 2p 2s Complete the diagram for the F2 molecule. Remember to add direction of energy, label the fragments and to label the molecular orbitals. 3 marks b) Calculate the bond order of the F2 molecule. Show the calculation. 3 marks c) If F2 were to gain an electron, would the new species/ion be diamagnetic or paramagnetic? Motivate your answer. 3 marks [9]