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Question

The value of x in the following reaction is ______.

2Na+2H2OxNaOH+H2


A

1

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B

2

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C

3

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D

4

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Solution

The correct option is B

2


Keeping in mind that a balanced chemical equation has an equal number of atoms of each element on both the sides, let us balance the given equation.

Reactants side:
Number of H atoms = 4, number of O atoms = 2 and number of Na atoms = 2

Products side:
Number of H atoms = 2+x, number of O atoms = x and number of Na atoms = x

Putting x=2 balances the given equation.

2Na+2H2O2NaOH+H2


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