(b) In peroxosulphuric acid 
sulphur
is in + 6 oxidation state
(c) Iron powder along with 
and
is used as a catalyst in the
preparation of 
by Haber's process
(d) Change in enthalpy is positive for the preparation of
803 by catalytic oxidation of 
Answer:
(a,
b)
Structure or 
is as shown
below
It contains one S?S bond.
(b) In peroxosulphuric acid 
sulphur
is in + 6 oxidation state.
Structure of g is
Let oxidation, state of S = x
2 x ( + 1) + x + 3 x (-2) + 2 x (-1) = 0
x - 6 = 0
x = 6
(c) During preparation of ammonia, iron oxide with small
amount of 
and 
is
used
as a catalyst to increase the rate of attainment of
equilibrium.
(d) Change in enthalpy is negative for preparation of SO3
by catalytic oxidation of SO2.
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