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 options are
B $8 F e + S_{8} \to 8 F e S$
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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