The unbalanced equation is

2 H_{2} O_{2} \to 2 H_{2} O + O_{2}

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C a O + H_{2} O \to C a (O H)_{2}

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2 M g + O_{2} \to 2 M g O

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H_{2} + O_{2} \to 2 H_{2} O

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Solution

The correct option is D $H_{2} + O_{2} \to 2 H_{2} O$
$H_{2} + O_{2} \to 2 H_{2} O$ is an unbalanced equation because the number of hydrogen atoms are not same on both sides.

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Similar questions

An unbalanced equation is known as a ___ equation.

Why do some equations become unbalanced???

a H_{3} B O_{3} \to b B_{2} O_{3} + c H_{2} O

C a_{2} B_{6} O_{11} Δ - \to [X] + C a C O_{3} + N a B O_{2}

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