In the manufacture of magnesium by carbon reduction of MgO, the product is cooled in a stream of an inert gas. Why?

The product in the reduction of PbO with carbon is

Reduction of metal sulphides directly with carbon is not possible. Why?

Although thermodynamically feasible, in practice , magnesium metal is not used for the reduction of alumina in the metallurgy of aluminium .Why?

Although thermodynamically feasible , in practice , magnesium metal is not used for the reduction of alumina in the metallurgy of aluminium . Why

How do you count the following observations? a) Though alkaline potassium permanganate and acidic potassium permanganate both are used as oxidants, yet in the manufacture of benzoic acid from toluene we use alcoholic potassium permanganate as an oxidant. Why ? Write balanced redox equation for the reaction. b) When concentrated sulphuric acid is added to inorganic mixture containing chloride, we get colourless pungent smelling gas HCl, but if the mixture contains bromide then we get red vapour of bromine. Why ?

A piece of magnesium ribbon was heated to redness in an atmosphere of nitrogen and then cooled with water. The gas evolved is