46. (1) A metal   47. (2) A non-metal.   48. (ii) Which concentrated acid will oxidize sulphur directly to sulphuric acid? Write the equation for the same.   49. (iii) What is the name of the process by which sulphuric acid is manufactured? Name the catalyst used in the process.   50. (iv) Complete the following sentence choosing the correct word from the brackets. Concentrated sulphuric acid is used in the laboratory preparation of nitric acid and hydrochloric acid because it is ............(less volatile/stronger) in comparison to these two acids.