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Hess' Law

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Question

State True or False.
$H {N O}_{3}$ is added in $I I$ group. filtrate during basic radical analysis to convert ${F e}^{2 +}$ to ${F e}^{3 +}$ as well as to oxidise $H_{2} S$ in solution.
Enter 1 if true else 0.

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Solution

Nitric acid is added to oxidise ferrous ion into ferric ion as
$H N O_{3} + F e^{+ 2} \to F e^{+ 3} + N O$

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