or
and
why?
(ii) Explain why 
is a
strong oxidising agent?
(iii) Explain why 
ion
is not stable in aqueous solutions? [3]
(b) Describe the oxidising property of 
in
neutral or faintly alkaline medium for its reaction with iodide ions and this sulphate
ions. [2]
Or
Account for the following.
(i) Ox anions of a metal show higher oxidation state.
(ii) Oxidising power in the series 
(iii) Actinoid contraction is greater from element to
element than lanthanoid contraction.
(b) Silver atom has completely filled d-orbitals (4d10)
in its ground state. How can you say that it is a transition
element? [2]
Answer:
(a) (i) 
is a
better reducing agent than 
In the formation of 
stability
increases henceis
a better reducing agent. [1]
(ii)
Since E° is positive it indicates that 
is a
better oxidising agent. It can oxidise 
but
rate is very slow hence it is a good analytical reagent. [1]
(iii)In aqueous solution, C^ undergoes disproportions
Thus, it
is spontaneous.
is
thus unstable in aqueous solution. [1]
(b)
[1]
[1]
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