1..Silver ions can be estimated by titration with KCN soln.The reaction is followed by the self indicator which is ?

a.insoluble complex formed with excess Ag+

b.complex of Ag+ with CN- colored

c.Formaton of Ag by reduction of Ag+

d.Formation of insoluble AgCN

2.When MN(NO3)2 is treated with conc.HNO3 and PBO2, a pink color is obtained on dilution due to the formation of compound (X)

the anhydride of X is

a.MnO2    b.Mn3O4  c.MnO  d.Mn2O7

3.Complex of iodine with metal is more stable than that of flourine bcos

a.Back donation of electrons

b.low electronegativity

c.large size

d.low electronic affinity...

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