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7. Redox reactions — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry7. Redox reactions1 Mark
MCQ
Which of the following processes does not involve oxidation of iron?
  • ✓
    Formation of $Fe(CO)_5$ from $Fe.$
  • B
    Liberation of $H_2$ from steam by iron at high temperature.
  • C
    Rusting of iron sheets.
  • D
    Decolourisation of blue $CuSO_4$ solution by iron.
✓

Answer

Correct option: A.
Formation of $Fe(CO)_5$ from $Fe.$
a
$\stackrel{0}{\mathrm{Fe}}+\mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2} \rightarrow \stackrel{+3}{\mathrm{Fe}_{2} \mathrm{O}_{3}} \cdot \mathrm{xH}_{2} \mathrm{O}$

$\stackrel{0}{\mathrm{Fe}}+\mathrm{CuSO}_{4} \rightarrow \stackrel{+2}{\mathrm{FeSO}_{4}}+\mathrm{Cu}$

$\stackrel{0}{\mathrm{Fe}}+5 \mathrm{CO} \rightarrow \stackrel{0}{\mathrm{Fe}}(\mathrm{CO})_{5}$

$\stackrel{0}{Fe}+\mathrm{H}_{2} \mathrm{O} \rightarrow \stackrel{+3}{\mathrm{Fe}_{2} \mathrm{O}_{3}}+\mathrm{H}_{2}$

above reactions shows the oxdiation state of iron for all given condition.

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