The compound A, B and C are
A) A - \[F{{e}_{2}}{{O}_{3}}\] B - \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] C - \[C{{r}_{2}}{{O}_{3}}\]
B) A - \[C{{r}_{2}}{{O}_{3}}\] B - \[N{{a}_{2}}C{{r}_{2}}{{O}_{7}}\] C - \[F{{e}_{2}}{{O}_{3}}\]
C) A - \[FeO\,\,C{{r}_{2}}{{O}_{3}}\] B - \[C{{r}_{2}}{{O}_{3}}\] C - \[N{{a}_{2}}C{{r}_{2}}{{O}_{7}}\]
D) A - \[FeC{{r}_{2}}{{O}_{4}}\] B - \[N{{a}_{2}}C{{r}_{2}}{{O}_{7}}\] C - \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]
Correct Answer: D
Solution :
[d] (i)
(ii) 
(iii) 
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