Which of the following is not a neutral oxide?

Non-metals form two types of oxides. Choose these two types from the following oxides:
$SO_2, NO_2, CO, H_2O, N_2O$

Name the following:
$(a)$ $A$ metal which is preserved in kerosene.
$(b)$ $A$ lustrous coloured non-metal.
$(c)$ $A$ metal which can melt while kept on palm.
$(d)$ $A$ metal which is a poor conductor of heat.

What is the process of extracting a metal from its ore and obtaining it in a pure form called?

Which of the following gases is combustible?

Name one metal and one non-metal that are found in a liquid state at room temperature.