On balancing the given redox reaction, the coefficients a, b and c are found to be respectively [2023]

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Solution

Q.
On balancing the given redox reaction,
$a {Cr}_{2} O_{7}^{2 -} + b {SO}_{3}_{(a q)}^{2 -} + c H_{(a q)}^{+} \to 2 a {Cr}_{(a q)}^{3 +} + b {SO}_{4}_{(a q)}^{2 -} + \frac{c}{2} H_{2} O_{(l)}$
the coefficients a, b and c are found to be respectively [2023]

1 1, 8, 3

2 8, 1, 3

3 1, 3, 8

4 3, 8, 1

Ans.
(3)

${Cr}_{2} {O_{7}}_{(a q)}^{2 -} + 3 {SO}_{3}_{(a q)}^{2 -} + 8 H_{(a q)}^{+} ⟶ 2 {Cr}_{(a q)}^{3 +} + 3 {SO}_{4}_{(a q)}^{2 -} + 4 H_{2} O_{(l)}$

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