Explain giving the equation, what happens when : (a) ZnCO3 is heated in the absence of air? (b) A mixture of Cu2O and Cu2S is heated?
What happens when copper comes in contact with dilute HCl in the absence of air?
Name the products formed when :
(a) wood is burnt in the absence of air.
(b) bone is heated in the absence of air.
(c) diamond is burnt in air at 900∘C.
(d) graphite is subjected to high pressure and 3000∘ C temperature.