1.) A metal acts as a good reducing agent. It reduces Fe 2 O 3 and MnO 2 . The reaction with Fe 2 O 3 is used to weld broken railway tracks. Identify the metal and write all the chemical reactions.
2.) 2.)A yellow coloured powder ‘X’ is soluble in carbon disulphide. It burns with a blue flame forming suffocating smelling gas which turns moist blue litmus red. Identify ‘X’ and write the chemical reaction.
3.) 3.)An element reacts with oxygen to form an oxide which dissolves in dilute hydrochloric acid. The oxide formed also turns a solution of red litmus blue. IS THE ELEMENT A METAL OR A NON-METAL? Explain with the help of a suitable example.
1) The metal is aluminium.The reactions are as follows:
Fe2O3 + 2 Al → 2 Fe + Al2O3
This reaction is used in welding of railway tracks.
3 MnO2 + 4 Al → 3 Mn + 2 Al2O3
2) X is suphur.The reaction is as follows:
3) Since the oxide is soluble in acid and turns red litmus blue, it is basic.Basic oxides are formed by metals.Therefore, the element is a metal.Example:Magnesium oxide(MgO).It reacts with HCl as follows: