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7. Redox reactions — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry7. Redox reactions1 Mark
MCQ
In which of the following redox reaction precipitate is not formed ?
  • ✓
    $C{{r}^{3+}}(aq.)\,+\,N{{a}_{2}}{{O}_{2}}(Solution)\,\to $
  • B
    $F{e^{3 + }}(aq.)\, + \,{(N{H_4})_2}S\, \to $
  • C
    $M{n^{2 + }}(aq.)\, + \,{H_2}{O_2} + N{H_3}(Solution)\, \to $
  • D
    $F{e^{2 + }}(aq.)\, + \,N{a_2}{O_2}(Solution)\, \to $
✓

Answer

Correct option: A.
$C{{r}^{3+}}(aq.)\,+\,N{{a}_{2}}{{O}_{2}}(Solution)\,\to $
a
$\mathrm{Cr}^{3+}(a q .)+\mathrm{Na}_{2} \mathrm{O}_{2}$ sol. $\longrightarrow \mathrm{CrO}_{4}^{2-}(a q .)$

$\mathrm{Fe}^{3+}(a q .)+\left(\mathrm{NH}_{4}\right)_{2} \mathrm{S} \longrightarrow \mathrm{Fes} \downarrow$

$\mathrm{Mn}^{2 +}(a q .)+\mathrm{H}_{2} \mathrm{O}_{2}+\mathrm{NH}_{3} \longrightarrow \mathrm{MnO}(\mathrm{OH})_{2} \downarrow$ or $\mathrm{MnO}_{2} \downarrow .2 \mathrm{H}_{2} \mathrm{O}$

$\mathrm{Fe}^{2 +}(a q .)+\mathrm{Na}_{2} \mathrm{O}_{2} \mathrm{sol} \longrightarrow \mathrm{Fe}(\mathrm{OH})_{3} \downarrow$

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