A) \[SO_{3}^{2-},CrO_{4}^{2-}\]
B) \[S{{O}_{3}},CrO_{4}^{2-}\]
C) \[S{{O}_{2}},CrO_{4}^{2-}\]
D) \[S{{O}_{2}},C{{r}_{2}}O_{7}^{2-}\]
Correct Answer: B
Solution :
\[S{{O}_{3}}\]and\[CrO_{4}^{2-}\]have the same oxidation number of sulphur and chromium. Let the oxidation number of S is\[x\]in\[S{{O}_{3}}\] \[x+3(-2)=0\] \[x-6=0\] \[x=+6\] Let the oxidation number of Cr is\[x\]in \[CrO_{4}^{2-}\] \[x+\text{ }4(-2)=-2\] \[x-8=-2\] \[x=-2+8=+6\]
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