The oxidation number is changed in which of the following case?

Question

The oxidation number is changed in which of the following case?, S O 2 gas is passed into C r 2 O 7 2 - / H +, Aqueous solution of C r O 4 2 - is acidified, C r O 2 C l 2 is dissolved in N a O H, C r 2 O 7 2 - solution is made alkaline .

MARKS App · Accepted Answer

a C r 2 O 7 2 - + 6 + S O 2 + 4 + 2 H + → 2 C r 3 + + 3 + 3 S O 4 2 - + 6 + H 2 O b 2 C r O 4 2 - + 6 + 2 H + → C r 2 O 7 2 - + 6 + H 2 O c CrO 2 Cl 2 +6 + 2NaOH → Na 2 CrO 4 d C r 2 O 7 2 - + 6 + 2 O H - → 2 C r O 4 2 - + 6 + H 2 O

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