The formula of the complex formed in the ring | vedclass

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(A) The brown ring test is used to detect the presence of nitrate $(NO_3^-)$ or nitrite $(NO_2^-)$ ions in a solution. When a freshly prepared ferrous

Vedclass · Accepted Answer

$[Fe(H_2O)_5 NO]^{2+}$

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(A) The brown ring test is used to detect the presence of nitrate $(NO_3^-)$ or nitrite $(NO_2^-)$ ions in a solution. When a freshly prepared ferrous sulfate $(FeSO_4)$ solution is added to the nitrate solution,followed by the careful addition of concentrated sulfuric acid $(H_2SO_4)$ along the sides of the test tube,a brown ring is formed at the interface. The brown ring is due to the formation of the complex $[Fe(H_2O)_5 NO]^{2+}$. In this complex,the iron is in the $+1$ oxidation state.

The formula of the complex formed in the ring test for $NO_2^-$ and $NO_3^-$ is .....

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