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Question

Two molecules of hydrogen and one molecule of oxygen reacts to give __ molecule(s) of water.


A

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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


Two molecules of hydrogen and one molecule of oxygen reacts to give 2 molecule(s) of water.

Let us see how:

First, let us write the skeletal equation
H2+O2H2O

there are 2 oxygen atoms in the reactants side, multiply H2O by 2.

H2+O22H2O

there are 4 hydrogen atoms in the products side, multiply H2 hy 2

Finally, the required reaction is: 2H2+O22H2O


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