What type of oxide is phosphorus pentoxide $(P_4O_{10})$?

Which method is used for the purification of semiconductor metals?

$A$ piece of copper can displace metal from the solution of which of the following?

How many atoms of sulfur are present in one molecule of sulfur?

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

State whether the following statement is true or false:
$A$ solution of an ionic compound in water contains ions,which move to the opposite electrodes when electricity is passed through the solution.