Answer:
Decomposition of zinc carbonate when heat is applied.
\[ZnC{{O}_{3}}\xrightarrow{Heat}\underset{Zinc oxide}{\mathop{ZnO}}\,+\underset{Carbon dioxide}{\mathop{C{{O}_{2}}}}\,\]
Decomposition of water in presence of electricity:
\[2{{H}_{2}}O\xrightarrow{~Electricit{{y}_{{}}}}2{{H}_{2}}+{{O}_{2}}\left( g \right)\]
Decomposition of silver chloride in presence of light.
\[2AgCl\xrightarrow{Sunlight~}2Ag\mathrm{ }+\mathrm{ }C{{l}_{2}}\]
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