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We know that when nitrogen oxide (NO) combines with Fe (II) ions, a brown complex is formed. This reaction is called brown ring test. Which of the following reactions is correct?

1. Fe(NO2)2 → Fe3+
2. Fe(NO2)2 + 2 NO → Fe(NO)2
3. Fe(NO2)2 + 2 NO → Fe(NO)2 + NO2
4. Fe(NO2)2 + 2 NO → Fe(NO)2 + N2O

Correct answer: Fe(NO2)2 + 2 NO → Fe(NO)2 + N2O

Solution

The brown ring test involves the formation of a brown complex due to the reaction of Fe(II) ions with NO, producing Fe(NO)2 and N2O as products. This matches option D.

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