A) \[{{K}_{2}}Cr{{O}_{4}}\]
B) \[Cr{{O}_{3}}\]
C) \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]
D) \[{{\left( N{{H}_{4}} \right)}_{2}}C{{r}_{2}}{{O}_{7}}\]
Correct Answer: C
Solution :
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