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STD 11 - 7. Redox reactions — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 7. Redox reactions4 Marks
MCQ
Which of the following equations is a balanced one ?
  • A
    $5BiO_3^- + 22H^+ +Mn^{2+} \to 5Bi^{3+} + 7H_2O + MnO_4^-$
  • ✓
    $5BiO_3^- + 14H^+ + 2Mn^{2+} \to 5Bi^{3+} + 7H_2O + 2MnO_4^-$
  • C
    $2BiO_3^- + 4H^+ +Mn^{2+} \to 2Bi^{3+} + 2H_2O + MnO_4^-$
  • D
    $6BiO_3^- + 12H^+ + 3Mn^{2+} \to 6Bi^{3+} + 6H_2O + 3MnO_4^-$
✓

Answer

Correct option: B.
$5BiO_3^- + 14H^+ + 2Mn^{2+} \to 5Bi^{3+} + 7H_2O + 2MnO_4^-$
b
The balanced redox equation is as given below:

$5 \mathrm{BiO}_{3}^{-}+14 \mathrm{H}^{+}+2 \mathrm{Mn}^{2+} \rightarrow 5 \mathrm{Bi}^{3+}+7 \mathrm{H}_{2} \mathrm{O}+2 \mathrm{MnO}_{4}^{-}$

In this equation, the number of atoms of each element on the left side are equal to the number of atoms on the right side.

The charges are also balanced on the two sides of equation.

Hence, option B is the correct answer.

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