(1999, 2M)
(a) oxygen
(b) ammonia
(c) nitrous oxide
(d) nitrogen
Correct Answer: 33. (d)
Solution:
$\left(NH _4\right) _2 Cr _2 O _7 \xrightarrow{\text { Heat }} N _2+Cr _2 O _3+4 H _2 O$
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