Assertion : When NO reacts with FeSO_4, a brown coloured complex …

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MCQ

Assertion : When $NO$ reacts with $FeSO_4$, a brown coloured complex is formed.

Reason : In the complex, the coordination number of $Fe$ is $6$.

A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
✓
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
C
If the Assertion is correct but Reason is incorrect.
D
If both the Assertion and Reason are incorrect.

✓

Answer

Correct option: B.

If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

b
In the qualitative analysis of nitrate, brown ring is formed due to the formation of $[Fe(H_2O)_5(NO)]^{2+}$. The chemical reactions showing the formation of complex are asfollows:

$2NaN{{O}_{3}}\,+\,{{H}_{2}}S{{O}_{4}}\,\to \,2NaHS{{O}_{4}}\,+\,2HN{{O}_{3}}$

$2HN{{O}_{3}}\,+\,6FeS{{O}_{4}}\,+\,3{{H}_{2}}S{{O}_{4}}\,\to \,$ $3F{{e}_{2}}{{(S{{O}_{4}})}_{3}}\,+\,2NO\,+\,4{{H}_{2}}O$

$FeS{{O}_{4}}\,+\,NO\,+\,5{{H}_{2}}O\,\to \,[Fe{{({{H}_{2}}O)}_{5}}(NO)]S{{O}_{4}}$

It is clearly seen from the formula, that the coordination number of $Fe$ in the brown ring complex is six (five $H_2O$ andone $NO$). Thus both assertion and reason correct but reason is not the incorrect explanation of assertion.