please answer 5-9 and i will leave a like. thanks:)

5. How many water molecules must be added to the halfreaction to balance the mass of oxygen atoms? CN(aq)CNO(s) a. 1 on the left side b. 1 on the right side c. 2 on the left side d. 2 on the right side e. no water molecules are needed 6. Which of the following represents an oxidation half-reaction? a. Zn2+(aq)Zn(s) b. Cl2(g)2Cl(aq) c. SnO(s)SnO2(s) d. ClO3(aq)ClO2(aq) e. all of these are oxidation half-reactions 7. Which of the following represents a reduction half-reaction? a. H2(g)H2O(el) b. NO2(g)NH2(aq) c. Cl(aq)ClO3(aq) d. H2ArO4(aq)As2S3(s) e. Cd(s)Cd2+(aq) 8. Which of the following represents a balanced half-reaction for the following? S(s)SO2(g) a. 2H2O(el)+S(s)+4eSO2(g)+4H b. 2H2O(el)+S(s)SO2(g)+4H+4e c. H2O(el)+S(s)SO2(g)+2H+2e d. H2O(el)+S(s)+2eSO2(g)+2H e. S(s)SO2(g) 9. Which of the following represents a balanced half-reaction for the following when balanced in basic conditions? MnO4(aq)Mn2(aq) a. 4H2O(el)+MnO4(aq)+5eMn2+(aq)+8OH(aq) b. 2H2O(el)+MnO4(aq)+3eMn2(aq)+4OH(aq) c. 4H2O(el)+MnO4(aq)Mn2(aq)+8OH(aq) +5e d. 4H2O(el)+MnO4(aq)+7eMn2 * (aq)+3OH(aq) e. 4H2O(el)+MnO4(aq)Mn2+(aq)+8HH(aq)+7e