Consider the following equation, which represents a reaction in the extraction of chromium from its ore 2 Fe 2 O 3 ⋅ Cr 2 O 3 + 4 Na 2 CO 3 + 3 O 2 ⟶ 2 Fe 2 O 3 + 4 Na 2 CrO 4

Question

Consider the following equation, which represents a reaction in the extraction of chromium from its ore $2 Fe_{2} O_{3} \cdot Cr_{2} O_{3} + 4 Na_{2} CO_{3} + 3 O_{2} ⟶ 2 Fe_{2} O_{3} + 4 Na_{2} CrO_{4} + 4 CO_{2}$ Which one of the following statements about the oxidation states of the substances is correct?

Options:

Answer:

B

Solution:

$2 Fe_{2} + 3 O_{3} \cdot^{+ 3} Cr_{2} O_{3} + 4 Na_{2} CO_{3} + 3 O_{2}$ $\to 2 Fe_{2} + 3 O_{3} + 4 Na_{2} Cr O_{4} + 6 + 4 CO_{2}$ Hence, the oxidation state of chromium increase from $+ 3$ to $+ 6$

TestHub · Accepted Answer

2 Fe 2 ​ + 3 ​ O 3 ​ ⋅ + 3 Cr 2 ​ O 3 ​ + 4 Na 2 ​ CO 3 ​ + 3 O 2 ​ → 2 Fe 2 ​ + 3 ​ O 3 ​ + 4 Na 2 ​ Cr O 4 ​ + 6 ​ + 4 CO 2 ​ Hence, the oxidation state of chromium increase from + 3 to + 6

Chemistry - Metallurgy Question with Solution | TestHub

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