Electrical wires have a coating of an insulating material. The material generally used is

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

Write true or false for the following statement:
Silver and gold react with oxygen at high temperatures.

When finely powdered ore is placed on a rotating grooved table and rotated rapidly,the lighter impurities are removed. What is this method of concentration called?

$NH_{3}$ is used in the preparation of nitric acid by $.....$ process.

Give the formulae of the stable binary compounds that would be formed by the combination of the following pairs of elements:
$(a)$ $Mg$ and $N_{2}$
$(b)$ $Li$ and $O_{2}$
$(c)$ $Al$ and $Cl_{2}$
$(d)$ $K$ and $O_{2}$