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Question
Where does hydrogen occur in a free state?
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Solution
In the free state, hydrogen is found in traces in the earth's crust and atmosphere. Volcanic gases contain 0.025%, the earth's crust 0.98%, the earth's atmosphere 0.01% and the atmosphere of the Sun and stars 1.1%.
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Multiple Choice Question
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\[\ce{CO + H2<-H2O->CO2 + H}\]
Give a reason for the following.
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