A) \[\text{KCl}{{\text{O}}_{\text{3}}}\]
B) \[\text{Zn(Cl}{{\text{O}}_{\text{3}}}{{)}_{2}}\]
C) \[{{\text{K}}_{\text{2}}}\text{C}{{\text{r}}_{\text{2}}}{{\text{O}}_{7}}\]
D) \[{{\text{(N}{{\text{H}}_{\text{4}}}\text{)}}_{\text{2}}}\text{C}{{\text{r}}_{\text{2}}}{{\text{O}}_{\text{7}}}\]
Correct Answer: D
Solution :
Oxygen rich compounds like chlorate; per chlorate \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]etc., when heated gives oxygen but ammonium dichromate gives nitrogen gas when heated. \[2KCl{{O}_{3}}\xrightarrow[{}]{\Delta }2KCl+3{{O}_{2}}\uparrow \] \[2Zn{{(Cl{{O}_{3}})}_{2}}\xrightarrow[{}]{\Delta }ZnC{{l}_{2}}+3{{O}_{2}}\] \[4{{K}_{2}}Cr{{O}_{7}}\xrightarrow[{}]{\Delta }4{{K}_{2}}Cr{{O}_{4}}+2C{{r}_{2}}{{O}_{3}}+3{{O}_{2}}\uparrow \]\[{{(N{{H}_{4}})}_{2}}C{{r}_{2}}{{O}_{7}}\xrightarrow[{}]{\Delta }{{N}_{2}}\uparrow +C{{r}_{2}}{{O}_{3}}+4{{H}_{2}}O\]
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