AQA Jan 2010 Paper 2 Q5

Answers available below

areas outside the box will not be scanned for marking nitric acid is manufactured from ammonia in a process that involves several stages a in the first stage ammonia is converted into nitrogen monoxide and the following equilibrium is established nh g o g no g h o g h kj mol the catalyst for this equilibrium reaction is a platinum rhodium alloy in the form of a gauze this catalyst gauze is heated initially but then remains hot during the reaction a i in terms of redox state what happens to the ammonia in the forward reaction mark a ii suggest a reason why the catalyst must be hot mark a iii suggest a reason why the catalyst remains hot during the reaction mark a iv state how a catalyst increases the rate of a reaction marks wmp jan chem areas outside the box will not be scanned for marking b in the second stage nitrogen monoxide is converted into nitrogen dioxide the equation for the equilibrium that is established is shown below no g o g no g h kj mol explain why the equilibrium mixture is cooled during this stage of the process marks c in the final stage nitrogen dioxide reacts with water as shown by the following equation no g h o l h aq no aq hno aq give the oxidation state of nitrogen in each of the following no no hno marks turn over for the next question turn over wmp jan chem

Show answer