Question

C). State one relevant observation for each of following reaction
i). Action of conc. H2SO4 on hydrated copper sulphate
ii). Burning of NH3 in air
iii). Addition of C2H5OH to acetic acid in presence of conc. H2SO4
iv). Addition of dil. HCl on iron (III) sulphide
v). action of NaOH solution on ferrous sulphate solution​

Answer 1

a. Concentrated Sulphuric acid acts as dehydrating agent and removes the water of crystallisation from hydrated copper sulphate to produce anhydrous copper(II) sulfate. The reaction is reversible. 

b. when ammonia gas is burnt in an atmosphere of excess oxygen. Ammonia burns with a green flame when it burnt in an atmosphere of excess oxygen.