. Mention the type of chemical reaction that takes place when:(i) a magnesium ribbon is burnt in air.(ii) limestone is heated.(iii) silver bromide is exposed to sunlight.(iv) electricity is passed through acidified water.(v) ammonia and hydrogen chloride are mixed with each other.Write the chemical equation for each reaction.

(i) When a magnesium ribbon is burnt in air, a combustion reaction takes place. The magnesium reacts with oxygen in the air to form magnesium oxide. The chemical equation for this reaction is:

2Mg(s) + O2(g) → 2MgO(s)

(ii) When limestone (calcium carbonate) is heated, a thermal decomposition reaction occurs. The heat causes the limestone to break down into calcium oxide and carbon dioxide. The chemical equation for this reaction is:

CaCO3(s) → CaO(s) + CO2(g)

(iii) When silver bromide is exposed to sunlight, a photochemical decomposition reaction takes place. The light energy causes the silver bromide to break down into silver and bromine. The chemical equation for this reaction is:

2AgBr(s) → 2Ag(s) + Br2(g)

(iv) When electricity is passed through acidified water, an electrolysis reaction occurs. The water breaks down into hydrogen and oxygen. The chemical equation for this reaction is:

2H2O(l) → 2H2(g) + O2(g)

(v) When ammonia and hydrogen chloride are mixed together, a neutralization reaction occurs. The ammonia reacts with the hydrogen chloride to form ammonium chloride. The chemical equation for this reaction is:

NH3(g) + HCl(g) → NH4Cl(s)