Write equations for the following reactions :
Copper and concentrated nitric acid.
Cu(s)Copper+4HNO3(l)NitricacidāCu(NO3)2Coppernitrate+2NO2(g)Nitrogendioxide+2H2O(l)
(c) Write balanced equations for the following reactions: (i) dissolving sulphur trioxide in water. (ii) Aluminium powder is warmed with hot and concentrated caustic soda solution. (iii) Concentrated nitric acid is added to copper turnings kept in a beaker. (iv) Red lead (trilead tetroxide) is warmed with concentrated hydrochloric acid.