A) \[\,\text{Cr(B}{{\text{O}}_{\text{2}}}{{\text{)}}_{\text{3}}}\]
B) \[\text{CrB}\]
C) \[\text{C}{{\text{r}}_{\text{2}}}{{\text{(}{{\text{B}}_{\text{4}}}{{\text{O}}_{7}}\text{)}}_{\text{3}}}\]
D) \[\text{C}{{\text{r}}_{\text{2}}}{{\text{O}}_{\text{3}}}\]
Correct Answer: A
Solution :
\[N{{a}_{2}}{{B}_{4}}{{O}_{7}}\xrightarrow{\Delta }2NaB{{O}_{2}}+{{B}_{2}}{{O}_{3}}\] \[C{{r}_{2}}{{O}_{3}}+{{B}_{2}}{{O}_{3}}\to Cr{{(B{{O}_{2}})}_{3}}\]
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