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The balanced equation for the reaction of tin(II) salt with potassium ...

The balanced equation for the reaction of tin(II) salt with potassium heptaoxodichloromate (VI) in an acidic medium can be represented as \(SSn ^{2+}+ fCr _{2} 2 O _{7}^{2-}+ gH ^{+} \rightarrow hSn ^{4+}+ i -\) \(Cr ^{3+}+ jH _{2} O .\) e, \(f , g , i\) and \(j\) respectively
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  • A \(3,5,6,1\) and \(4\)
  • B \(3,1,14,3,2\) and 7
  • C \(3,2,6,1,5\) and 6
  • D \(5,2,1,5,3\) and 2
Correct Answer: Option B
Explanation:
\(Sn ^{2+}+ Cr _{2} O _{7}^{2-}+ H ^{-} \rightarrow Sn ^{4+}+ Cr ^{3+}+ H _{2} O\)
\(Sn ^{2+} \rightarrow Sn ^{4+}+2 e ^{-}\)(oxidation)
\(Cr _{2} O ^{2-}+14 H ^{-}+6 e ^{-} \rightarrow 2 Cr ^{1-}+7 H _{2} O\)
\begin{aligned}
&\text { Multiply the oxidation half cell by } 3\\
&\left[\frac{\left(\begin{array}{l}
3 Sn ^{2+} \rightarrow 3 Sn ^{4+}+6 e ^{-}+ Cr _{2} O _{7}^{2-} \\
+14 H ^{+}+6 e \rightarrow 2 Cr ^{3+}+7 H _{2} O
\end{array}\right)}{\left(\begin{array}{c}
3 Sn ^{2+}+ Cr _{2} O _{7}+14 H \\
\rightarrow 3 Sn ^{4+}+2 Cr ^{3+}+7 H _{2} O
\end{array}\right)}\right]\\
&e=3, f=1, g=14, h=3 \text {, }\\
&i=2, j=7
\end{aligned}

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