Identify the combination reactions among the following:

$2 C_{8} H_{18} + 25 O_{2} \to 16 C O_{2} + 18 H_{2} O$

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$8 F e + S_{8} \to 8 F e S$

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$M g O + C O_{2} \to M g C O_{3}$

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$3 P b (N O_{3})_{2} + 2 A l C l_{3} \to 3 P b C l_{2} + 2 A l (N O_{3})_{3}$

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Solution

The correct option is C
$M g O + C O_{2} \to M g C O_{3}$

In a combination reaction, two or more reactants combine to form a single product:
$A + B \to C$
Only in the following reactions, two reactants combine to form one product.
$8 F e + S_{8} \to 8 F e S M g O + C O_{2} \to M g C O_{3}$

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