The oxides of highly reactive metals such Na2O, CaO, MgO etc cannot be reduced by hydrogen.
The metal oxide which is reduced by hydrogen is _______ .
Name the following:
(a) Two metals which give hydrogen with cold water.
(b) A metal which liberates hydrogen only when ste am is passed over red hot metal.
(c)The process in which oxygen is added or hydro gen is removed.
(d)A metallic oxide which can be reduced into metal by hydrogen.