Answer:

2 molecules of H2

Explanation:

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The answer is Option C) 2 molecules of H2O

i.e The missing product is water.

    2 molecules of water are needed to balance the equation.

• A decomposition reaction is when one reactant breaks down to give two or more products.
• A decomposition reaction can be represented as AB ---> A + B, where AB represents the reactant and A and B represent the products of the reaction.
• The decomposition reaction of Hydrogen peroxide ( H2O2) gives water (H2O) and oxygen (O2), where Hydrogen peroxide is the reactant that begins the reaction, water and oxygen are its products.
• As a chemical equation it can be written as,                                                2 H2O2 ---> 2 H2O + O2
• Comparing this equation and the image given in the question, it is obvious that the red circles represent the oxygen ( ↑ implies gaseous product ) and the white circles represent the hydrogen.

• Therefore the question mark represents two water molecules which have to be represented by two images of a combination of a red circle with two white circles( H2O).
• Implying 2 molecules of H20 are missing in the reaction given.

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