What will be the balanced equation in acidic medium for the given reaction? Cr2O2-7(aq) + SO2(g) → Cr3+(aq) + SO2-4(aq)

Question

What will be the balanced equation in acidic medium for the given reaction? Cr2O2-7(aq) + SO2(g) → Cr3+(aq) + SO2-4(aq) (A) Cr2O2-7(aq) + 3SO2(g) + 2H+(aq) → 2Cr3+(aq) + 3SO2-4(aq)+ H2O(l) (B) 2Cr2O2-7(aq) + 3SO2(g) + 4H+(aq) → 4Cr3+(aq) + 3SO2-4(aq)+ 2H2O(l) (C) Cr2O2-7(aq) + 3SO2(g) + 14H+(aq) → 2Cr3+(aq) + 3SO2-4(aq)+ 7H2O(l) (D) Cr2O2-7(aq) + 6SO2(g) + 7H+(aq) → 2Cr3+(aq) + 6SO2-4(aq)+ 7H2O(l)

Tardigrade Admin · Accepted Answer

Cr2O2- + SO2 → Cr3+ + SO42- (in acidic solution) Oxidation half equation: SO2 + 2H2O -> SO4 + 4H+ + 2e- ...(i) Reduction half equation: Cr72-O2- + 14H+ + 6e- → 2Cr3+ + 7H2O ... (ii) Multiplying eqn. (i) by 3 and adding to eqn. (ii) we get Cr2O72- + 3SO2 + 2H+ → 2Cr3+ + 3SO42- + H2O

Q. What will be the balanced equation in acidic medium for the given reaction?
$C r_{2} O_{7 (a q)}^{2 -} + S O_{2 (g)} \to C r_{(a q)}^{3 +} + S O_{4 (a q)}^{2 -}$

$C r_{2} O_{7 (a q)}^{2 -} + 3 S O_{2 (g)} + 2 H_{(a q)}^{+} \to 2 C r_{(a q)}^{3 +} + 3 S O_{4 (a q)}^{2 -} + H_{2} O_{(l)}$

$2 C r_{2} O_{7 (a q)}^{2 -} + 3 S O_{2 (g)} + 4 H_{(a q)}^{+} \to 4 C r_{(a q)}^{3 +} + 3 S O_{4 (a q)}^{2 -} + 2 H_{2} O_{(l)}$

$C r_{2} O_{7 (a q)}^{2 -} + 3 S O_{2 (g)} + 14 H_{(a q)}^{+} \to 2 C r_{(a q)}^{3 +} + 3 S O_{4 (a q)}^{2 -} + 7 H_{2} O_{(l)}$

$C r_{2} O_{7 (a q)}^{2 -} + 6 S O_{2 (g)} + 7 H_{(a q)}^{+} \to 2 C r_{(a q)}^{3 +} + 6 S O_{4 (a q)}^{2 -} + 7 H_{2} O_{(l)}$

Q. What will be the balanced equation in acidic medium for the given reaction? Cr2​O7(aq)2−​+SO2(g)​→Cr(aq)3+​+SO4(aq)2−​

Cr2​O7(aq)2−​+3SO2(g)​+2H(aq)+​→2Cr(aq)3+​+3SO4(aq)2−​+H2​O(l)​

2Cr2​O7(aq)2−​+3SO2(g)​+4H(aq)+​→4Cr(aq)3+​+3SO4(aq)2−​+2H2​O(l)​

Cr2​O7(aq)2−​+3SO2(g)​+14H(aq)+​→2Cr(aq)3+​+3SO4(aq)2−​+7H2​O(l)​

Cr2​O7(aq)2−​+6SO2(g)​+7H(aq)+​→2Cr(aq)3+​+6SO4(aq)2−​+7H2​O(l)​

Q. What will be the balanced equation in acidic medium for the given reaction?
$C r_{2} O_{7 (a q)}^{2 -} + S O_{2 (g)} \to C r_{(a q)}^{3 +} + S O_{4 (a q)}^{2 -}$

$C r_{2} O_{7 (a q)}^{2 -} + 3 S O_{2 (g)} + 2 H_{(a q)}^{+} \to 2 C r_{(a q)}^{3 +} + 3 S O_{4 (a q)}^{2 -} + H_{2} O_{(l)}$

$2 C r_{2} O_{7 (a q)}^{2 -} + 3 S O_{2 (g)} + 4 H_{(a q)}^{+} \to 4 C r_{(a q)}^{3 +} + 3 S O_{4 (a q)}^{2 -} + 2 H_{2} O_{(l)}$

$C r_{2} O_{7 (a q)}^{2 -} + 3 S O_{2 (g)} + 14 H_{(a q)}^{+} \to 2 C r_{(a q)}^{3 +} + 3 S O_{4 (a q)}^{2 -} + 7 H_{2} O_{(l)}$

$C r_{2} O_{7 (a q)}^{2 -} + 6 S O_{2 (g)} + 7 H_{(a q)}^{+} \to 2 C r_{(a q)}^{3 +} + 6 S O_{4 (a q)}^{2 -} + 7 H_{2} O_{(l)}$