What type of chemical reactions take place when:
(a) a magnesium wire is burnt in air?
(b) lime-stone is heated?
(c) silver bromide is exposed to sunlight?
(d) electricity is passed through water?
(e) ammonia and hydrogen chloride are mixed?
a) Magnesium wire is burnt in air: Combination reaction.
$2Mg+O_{2}\rightarrow 2MgO$
b) lime-stone is heated: Decomposition reaction.
$CaCO_{3}\rightarrow CaO+CO_{2}$
c) silver bromide is exposed to sunlight: Decomposition reaction.
$2AgBr\rightarrow 2Ag+Br_{2}$
d) electricity is passed through water: Decomposition reaction.
$2H_{2} O\rightarrow 2H_{2} +O_{2}$
e) ammonia and hydrogen chloride are mixed: Combination reaction.
$NH_{3} +HCl\rightarrow NH_{4} Cl$
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