Which of the following is a combination reaction ?

$C (s) + O_{2} (g) ⟶ C O_{2} (g)$

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$H_{2} O_{2} ⟶ H_{2} + O_{2}$

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$Z n (s) + H g O (s) ⟶ Z n O (s) + H g (l)$

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None of these

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Solution

The correct option is A
$C (s) + O_{2} (g) ⟶ C O_{2} (g)$

Combination reactions: These reactions involve combining of two or more reactants to form a single product. It can be represented by a reaction of the type,

$A + B ⟶ A B$

For a redox reaction, either A or B or both must be in the elemental form. The combustion reactions of fuels are generally combination reactions of carbon and hydrocarbons with elemental dioxygen.

$C (s) + O_{2} (g) ⟶ C O_{2} (g)$

The above reaction is both a redox reaction as well as combination reaction.

Other examples of combination reactions are:

$2 0 M g (s) + {0 O}_{2} (g) ⟶ 2 + 2 M g - 2 O (s)$

$6 0 L i (s) + {0 N}_{2} (g) ⟶ 2 + 1 L i_{3} - 3 N (s)$

Do note that in the above reactions, the elemental reactants all have an oxidation number of 0. On the products' sides, you can see that the oxidation numbers of each element has changed.

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H g O (s) + H_{2} (g) \to H g (l) + H_{2} O (l)

Z n C O_{3 (s)} Δ - \to

Z n O_{(s)} + C_{(s)} Δ - \to

M n O_{2 (s)} + A l_{(s)} Δ - \to

Z n S_{(s)} + O_{2 (g)} Δ - \to

H g S + O_{2} (g) Δ - \to

1.35

Z n (H g) + H g O_{(s)} \to Z n O_{(s)} + H g_{(l)}

The following reaction is a/an –
$C (s) + O_{2} (g) \to C O_{2} (g) + H e a t$

Given that,

$Z n + \frac{1}{2} O_{2} \to Z n O + 35.25 K J$

$H g O \to H g + \frac{1}{2} O_{2} - 9.11 K J$

The heat of the reaction $Z n + H g O \to Z n O + H g$ is

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