Which of the following does not give oxygen on heating?
Explanation
(NH4)2Cr2O7
$$\buildrel \Delta \over
\longrightarrow $$ N2 + Cr2O3 + 4H2O
Zn(ClO3)2
$$\buildrel \Delta \over
\longrightarrow $$ ZnCl2 + 3O2
KClO3
$$\buildrel \Delta \over
\longrightarrow $$ KCl + $${3 \over 2}$$O2
2K2Cr2O7
$$\buildrel \Delta \over
\longrightarrow $$ 2K2CrO4 + Cr2O3 + $${3 \over 2}$$
O2