Fuel rods in a nuclear reactor are surrounded by a protective casing made of zircaloy, which remains chemically inactive at temperatures below 300C. However, if the temperature surpasses 300C, zircaloy undergoes an exothermic reaction with steam to produce a gas and a metal oxide. (a) Give a single-word answer for a gaseous substance produced from the reaction. (b) What is the oxidation state of zirconium in the metal oxide produced? Enter numerical values only. (c) Provide a single-word answer for a gaseous substance present in the air, that when combined with the gaseous product from the uncontrolled nuclear reaction, would undergo an explosive reaction