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which of the following is incorrect abou...

which of the following is incorrect about brown ring test ?
1. brown ring forms at the junction of two solution
2. The brown ring complex is `[Fe(H_2O)_5NO]SO_4`
3. It consists of ferrous nitro sulphate complex
4. `NO_3^(-) + H_2SO_4 rarr `Brown fumes are evolved

A

1

B

2

C

3

D

4

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