A) blue
B) green
C) red
D) orange-red
Correct Answer: A
Solution :
\[C{{O}_{2}}+{{H}_{2}}O{{H}_{2}}C{{O}_{3}}{{H}^{+}}+HCO_{3}^{-}\] \[\underset{yellow}{\mathop{2CrO_{4}^{2-}}}\,+2{{H}^{+}}\xrightarrow{{}}\underset{orange\,\,red}{\mathop{C{{r}_{2}}O_{7}^{2-}}}\,+{{H}_{2}}O\] Aqueous\[C{{O}_{2}}\]is acidic and changes yellow\[CrO_{4}^{2-}\]into orange\[C{{r}_{2}}O_{7}^{2-}\].
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