What are the types of combination reactions? Give examples of each type.
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What are the types of combination reactions? Give examples of each type.

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Combination reactions are of three types. These are discussed as follows:

1. Combination between two elements : In these reactions, two elements combine under suitable conditions to form a compound. A few examples of this type of combination reactions are:

(a) Carbon element burns in oxygen to form carbon dioxide

$$\text { C }+\mathrm{O}_2 \stackrel{\text { combustion }}{\longrightarrow} \mathrm{CO}_2$$

Carbon($C$)

Oxygen($O_2$)

Cabon dioxide($CO_2$)

(b) Iron and sulphur elements when heated form iron sulphide

$$\mathrm{Fe}+\mathrm{S} \stackrel{\text { heat }}{\longrightarrow} \mathrm{FeS}$$

Iron($Fe$)

Sulphur($S$)

Iron Sulphide($FeS$)

2. Combination between an element and a compound : In these reactions, one of the combining substances is an element whereas the other is a compound. A few examples of this type of combination reactions are:

(a) Carbon monoxide combines with oxygen to form carbon dioxide.

$$2 \mathrm{CO} \quad+\mathrm{O}_2 \longrightarrow 2 \mathrm{CO}_2$$

-Carbon monoxide($CO$)

Oxygen($O_2$)

Carbon dioxide($CO_2$)

(b) Sulphur dioxide combines with oxygen upon heating to form sulphur trioxide.

$$2 \mathrm{SO}_2+\mathrm{O}_2 \stackrel{\text { heat }}{\longrightarrow} 2 \mathrm{SO}_3$$

Sulphur dioxide, Oxygen, Sulphur trioxide

3. Combination between two compounds : In these combination reactions, two compounds take part to form a new compound. For example,

(a) Ammonia reacts with hydrogen chloride to form ammonium chloride.

$$\mathrm{NH}_3+\mathrm{HC} 1 \longrightarrow \mathrm{NH}_4 \mathrm{Cl}$$

Ammonia, Hydrogen, chloride Ammonium chloride

(b) Carbon dioxide combines with calcium oxide (quick lime) to form calcium carbonate.

$$\mathrm{CaO}+\mathrm{CO}_2 \longrightarrow \mathrm{CaCO}_3$$

Calcium oxide, Calcium carbonate, (Quick lime)

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