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29 May, 14:56

Which one of the following is not an example of a combination reaction a. 2H2O (I) - - - > 2H2 (g) + O2 (g) b. 2K+CI2--->2KCI c. 2H2+O2--->2H2O d. 2Mg+O2--->2MgO

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  1. 29 May, 15:48
    0
    The answer would be A.

    Combination reaction, otherwise known as synthesis reaction, occurs when two or more substances react and form a single, more complex substance.

    A combination reaction looks like this in an equation:

    A + B → AB

    reactants product

    So from two reactants they become one product.

    Let's take a look at choice A.

    2H₂O (l) → 2H₂ (g) + O₂ (g)

    reactant product (s)

    Notice that from one substance, it broke down into two substances. So this is not a combination reaction. This is what you call a decomposition reaction.
  2. 29 May, 17:28
    0
    In a combination reaction, two reactants combine to form one product therefore option A is NOT a combination reaction.
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