Which gas is produced when zinc reacts with diluted hydrochloric acid?

When sulfur dioxide gas is passed through lime water,which insoluble substance is formed that turns the solution milky?

What type of compounds are formed when reactive metals like sodium and potassium react with dihydrogen?

Generally,non-metals are not lustrous. Which of the following non-metal is lustrous?

Which one of the following metals does not react with cold as well as hot water?

$(i)$ Define the term 'anode mud'. Name the electrode made of pure metal.
$(ii)$ Give the reactions taking place at cathode and at anode during the electrolytic refining of copper.