i) `CaCO_(3(s))rarr CaO_((s)) +CO_(2(g))`
ii) `2AgBr_((s))rarr 2Ag_((s))+Br_(2(g))`
Mention the types of reaction of which the above equations belong. Also mention which of them is a photochemical reaction.

Explanation

1) i) `CaCO_(3(s))rarr CaO_((s)) +CO_(2(g))`. It is a chemical decomposition reaction.
ii) `2Ag Br_((s)) rarr 2Ag_((s))+Br_(2(g))`. Ig is also a chemical decomposition reaction.
2) `AgBr_((s))rarr 2A_((s))+Br_(2(g)).` It is a photochemical reaction. Because, this reaction takes place in the presence of sunlight only.