GIVER REASONS THAT WHY:
a) In the titration of KMnO4 solution only H2SO4 is used while
other mineral acids are avoided
b) after reduction the hot solution of Fe2+ ions is not titrated with KMnO4 solution.
c) a hot solution of C2O42- ions is titrated with KMnO4.
d) KMnO4 is better oxidizing agent than K2Cr2O7.
e) in the titartion of Fe2+ ions with K2Cr2O7 solution H3PO4 is added.
f) by the additiion of AgNO3 solution to Cr ions solution,
while ppt. of AgCl is formed but not a clear solution is obtained.
g) for the dertermination of Cr ions by volhard's method dil. HNO3
is added to the contents of conila flask.
h) AgCL ppts. are washed with 1:100 HNO3 and H2O solution.
i) H2SO4 is added to KIO3 and KI solution in iodemtric titration
j) the addition of solid Na2S to the contents of conical flask is