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Q.

Brown ring test of NO3- depends upon :

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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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Detailed Solution

NO3−+5+3Fe2++4H+→ 3Fe3++2H2O+NO+2FeH2O62++NO→ Fe+H2O5NO+Brown complex+H2O
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Brown ring test of NO3- depends upon :