![]() ![]() (c) Nitric (V) acid is used to make ammonium nitrate, state two uses of ammonium nitrate. (b) Write the equation for the catalyst oxidation of ammonia gas. (a) What is the name of the catalyst used? ![]() The first step in the industrial manufacture of nitric (V) acid is the catalyst oxidation of ammonia gas. (i) Write an equation for the reaction that took place. 100#cm^3# of the solution was neutralized by 40#cm^3# of 1.5M sulphuric (VI) acid. 17.6g of the mixture were dissolved in water to make one litre of solution. (b) Sodium hydroxide pellets were accidentally mixed with sodium chloride. (a) Name one raw material from which sodium hydroxide is manufactured. Identify the substance responsible for the: On addition of more aqueous ammonia, a deep blue solution was formed. When a few drops of aqueous ammonia were added to copper (II) nitrate solution, a light blue precipitate was formed. (ii) Name another substance that can be used instead of potassium nitrate. (i) Give a reason why it is possible to separate nitric (V) acid from sulphuric (VI) acid in the set-up. The diagram below shows a set-up that was used to prepare and collect a sample of nitric (V) acid. State one use of sodium hydrogen carbonate. (b) The use of materials made of lead in roof (II) The equation of the reaction in step 4. (I) The formula of the complex ion formed in step 3. (i) State the condition necessary in step 1. Study it and answer the questions that follow. (a) The flow chart below shows some reactions starting with lead (II) nitrate. Explain why a high temperature is required for nitrogen to react with oxygen. (b) What is the oxidation state of nitrogen in# Mg_3 N_2#. Nitrogen forms many compounds in which its oxidation state varies. (b) State and explain a precaution that must be taken before heating is stopped. Ammonium nitrate was heated as shown in the set-up below. (a) Explain why the pH of solution is above 7. Ammonia gas was passed into water as shown below. (a) How would the yield of ammonia be affected if In the Haber process, the optimum yield of ammonia is obtained when a temperature of 4500 C, a pressure of 200 atmospheres and an iron catalyst are used. Ammonium nitrate was gently heated and the products collected as shown in the diagram below.ĭescribe one chemical and one physical method that State how these gases affect the environment. Nitrogen (II) oxide and nitrogen (IV) oxide are some of the gases released from car exhaust pipes. (b) Name one suitable drying agent for ammonia gas. (a) Give a reason why concentrated sulphuric (VI) acid is not used to dry ammonia gas. The solution turned from pale green to yellow with evolution of brown gas. Concentrated nitric (V) acid was added to Iron (II) sulpahte acidified with dilute sulphuric (VI) acid and the mixture heated. (b) Study the flow chart below and answer the following questions. (Boiling points nitrogen= -1960 C, oxygen= -1830 C). (ii) Describe how nitrogen gas is obtained from the liquid air. (i) Name one substance that is used to remove carbon (IV) oxide from the air before (a) Fractional distillation of liquid air usually produces nitrogen and oxygen as the major products. (b) Write an ionic equation for the reaction in step II that produces solid F. Study the scheme below and answer the questions that follow. (b) State the observations which were made in the beaker. A student set up the apparatus shown below to prepare ammonia gas and react it with copper (II) sulphate solution. ![]() (b) Write an equation for the reaction that occurs when solid potassium Concentrated sulphuric (VI) acid was then carefully added to the mixture. (a) A few drops of freshly prepared iron (II) sulphate solution were added to potassium nitrate solution in a test-tube. (c) Explain why it is necessary to compress nitrogen and (b) State one other source of hydrogen gas apart from natural gas. (ii) Reaction that takes place in step 5. ![]() The flow chart below shows the industrial preparation of ammonia and the process used in the manufacture of some ammonium compounds. (v) Give a reason why liquid nitrogen is used for storage (iv) Give the name of one impurity present in the nitrogen gas obtained. (iii) Write an equation for the reaction which took place in tube P. (ii) What is the purpose of sodium hydroxide? Study it and answer the questions that follow: (a) The diagram below represents a set up that was used to obtain dry nitrogen from air. (iv) If 320 #cm^3# of ammonia gas reacted completely with the copper, calculate:n (iii) Write an equation for the reaction that took place in tube K. (ii) What observation would be made in tube K after heating for some time? (a) The diagram below shows a set-up that can be used to obtain nitrogen gas in an experiment. ![]()
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