What is formed when boiling sulfur reacts with dihydrogen gas?

In the electrolytic refining of metals, the insoluble impurities present in the impure metal settle down at the bottom of the container below the anode. What is this called?

What is the electronic configuration of sulphur?

Generally,metals are solid in nature. Which one of the following metals is found in liquid state at room temperature?

What happens when copper oxide is heated in the presence of dihydrogen gas?

Which of the following is a compound of hydrogen and oxygen?