A) oxygen
B) hydrogen
C) sulphur dioxide
D) hydrogen sulphide
Correct Answer: A
Solution :
Potassium dichromate, on heating, gives oxygen and green chromic oxide \[(C{{r}_{2}}{{O}_{3}})\] vapour. \[4{{K}_{2}}C{{r}_{2}}{{O}_{7}}\xrightarrow{\Delta }4{{K}_{2}}Cr{{O}_{4}}+\underset{green}{\mathop{2C{{r}_{2}}{{O}_{3}}}}\,\uparrow +3{{O}_{2}}\uparrow \] Though ammonium dichromate, on heating gives nitrogen gas. \[{{(N{{H}_{4}})}_{2}}C{{r}_{2}}{{O}_{7}}\xrightarrow{\Delta }{{N}_{2}}+C{{r}_{2}}{{O}_{3}}+4{{H}_{2}}O\]
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