A) Oxygen
B) Ammonia
C) Nitrous oxide
D) Nitrogen
Correct Answer: D
Solution :
\[{{(N{{H}_{4}})}_{2}}C{{r}_{2}}{{O}_{7}}\,\,\to \,\,{{N}_{2}}+C{{r}_{2}}{{O}_{3}}+4{{H}_{2}}O\]
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