TUTORIAL 4: CHEMICAL EQUATION & STOICHIOMETRY

1. The oxidation number of manganese in KMnO4 is +4 +3 +1 +7 2. Oxygen has an oxidation number of -2 in O2 Na2O2 OF2 NO2 3. An Oxidation number can be positive negative zero All of above 4. The elements whose oxidation number is increased are reduced hydrogenated oxidized oxygenated 5. The oxidation state of any free element is always 0 1 2 3 6. When the following equation is balanced with the smallest possible integer coefficients, what is the coefficient of H+? _Cr + _H+ → _Cr3+ + _H2 2 3 5 6 7. In the following reaction, the oxidation number of Fe changes from _ to _. Fe2O3 + 3CO → 2Fe + 3CO2 0, +2 +3, 0 doesn't change +2,0 8. MnO4- + HSO3-→ MnO42- + SO42-For the above reaction , the oxidizing agent is _ and the reducing agent is _ MnO4- , HSO3- OH-,HSO3- MnO4-,OH- HSO3-,MnO4- 9. In the oxidation-reduction reaction below ClO3- + Cl-→ Cl2 + ClO2 Cl is oxidized and O is reduced. Cl is both oxidized and reduced. O is oxidized and Cl is reduced. O is both oxidized and reduced. 10. The following reaction occurs in acidic aqueous solution: H3AsO4 + Zn → AsH3 + Zn2+ H3AsO4 is a(n) _ agent in which the oxidation number of As is _. reducing, +3 oxidizing, +5 reducing, +5 oxidizing, +3 11. Which one of the following reactions is an oxidation reduction reaction? 3CuO+2NH3 →3Cu+3H2O+N2 3Ca(OH)2 + 2H3PO4 → Ca3(PO4)2 + 3H2O CaSO3+2HCl→CaCl2+H2O+ SO2 NaCl + AgNO3 → AgCl +NaNO3 12. Balance the following equation using minimum integral coefficients: NH3+ O2 →NO2 + H2O The stoichiometric coefficient for oxygen gas O2 is: 1 3 7 5 13. What is a limiting reactant? the reactant that is in excess the product that you can make the most of the reactant that determines how much product can be made the amount of reactants that react with each other 14. Which of the following statements is FALSE for the chemical equation given below in which nitrogen gas reacts with hydrogen gas to form ammonia gas assuming the reaction goes to completion? N2 + 3H2 → 2NH3 The reaction of one mole of H2 will produce 2 moles of NH3. One mole of N2 will produce two moles of NH3. One molecule of nitrogen requires three molecules of hydrogen for complete reaction. The reaction of three moles of hydrogen gas will produce 17 g of ammonia.