A) red
B) green
C) yellow
D) pink
Correct Answer: B
Solution :
In acid medium \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] gives green colour. This is due to change of oxidation number of chromium from \[+6\] to \[+3\]. \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}+4{{H}_{2}}S{{O}_{4}}\xrightarrow{{}}C{{r}_{2}}{{(S{{O}_{4}})}_{3}}+{{K}_{2}}S{{O}_{4}}\]\[+4{{H}_{2}}O+3[O]\]
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