Question

Write your observation and a balanced equation in the case of the following substances being heated.

Ammonium dichromate.

Answer 1

When ammonium dichromate is heated Orange red colour crystalline solid on strong heating swells up & decomposes violently with flashes of light. Greenish residue also gives of steamy dunes which condense cooler part of the test tube to form tiny droplets of water.

\[\ce{\underset{\text{Orange red}}{(NH4)2Cr2O7} ->[\Delta] \underset{\text{greenish grey}}{Cr2O3} + N2↑ + 4H2O↑}\]