Identify Metal T, Metal U, and list the order of reactivity of metals T, S, and U. Also, name an ore of iron and state the region of lowest temperature in a blast furnace.

a) Metal T is likely to be magnesium. Magnesium reacts vigorously with dilute acids and burns vigorously in oxygen, which matches the description for metal T. Although magnesium reacts slowly with cold water, its vigorous reactions with acid and oxygen make T the most probable candidate among the given options.

b) Metal U may be used to make a cooking pot. Metal U shows no reaction with cold water and no reaction with dilute acid, indicating it is unreactive. Unreactive metals are suitable for cooking pots as they do not react with food or water.

c) The order of reactivity starting with the most reactive is:

• T > S > U

a) One ore from which iron can be extracted is Hematite ($\text{Fe}_2\text{O}_3$). Other examples include Magnetite ($\text{Fe}_3\text{O}_4$) or Siderite ($\text{FeCO}_3$).

b) The temperature in the blast furnace is lowest at point R. The raw materials are added at the top (R), and the temperature gradually increases towards the bottom (T) where hot air is blasted in and coke burns.