Which method is used for the refining of copper metal?

$A$ metal $E$ is stored under kerosene oil. When a small piece of it is left open in the air,it catches fire. When the product formed is dissolved in water,it turns red litmus blue.
$(i)$ Name the metal $E$.
$(ii)$ Write the chemical equations for the reaction when it is exposed to air and when the product is dissolved in water.
$(iii)$ Explain the process by which the metal is obtained from its molten chloride.

Which metal is more reactive than magnesium $(Mg)$?

Which of the following is a noble metal?

What change occurs in the concentrated ore during the roasting process?

Name a non-metal which is lustrous and a metal which is non-lustrous.