What is the action of heat on $K_{2}C{r}_2{O}_7$?

Action of Heat: On heating $K_{2}C{r}_2{O}_7$ decomposes to give Potassium chromate with evolution of $O_2$ gas.
$4K_{2}C{r}_2{O}_7\to 4K_{2}Cr{O}_4+2C{r}_2{O}_3+3O_2$