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Question

Which one of the following reaction is not balanced?


A

2KI + H2O2 → 2KOH + I2

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B

CaCO3 → CaO + CO2

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C

Mg + 2HCl → MgCl2 + H2

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D

2Fe + 3H2O → Fe2O3 + H2

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Solution

The correct option is D

2Fe + 3H2O → Fe2O3 + H2


There are 6 hydrogen atoms on the reactant side while only 2 hydrogen atoms on the product side. To balance the hydrogen atoms, 3 should be written as a co-efficient of the hydrogen atoms present on the product side.

2Fe + 3H2O → Fe2O3 + 3H2


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