Q.
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a
the ability of Fe2+ to form a brown compound in its Fe3+ form
b
the ability of Fe2+ to reduce NO3- to NO and form a brown complex in +1 oxidation state
c
the ability to get oxidised by NO3-ion to Fe3+ form and then form brown coloured Fe2O3 .xH2O
d
All of the above
answer is B.
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