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Explain occurrence of hydrogen....

Explain occurrence of hydrogen.

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a. Hydrogen is present in the combined state in water to an extent of `11.1%` by mass.
b. It is also present in all organic compounds well as biomoleculdes.
c. It is also present in all stars because nuclear fusion reactions involve hydrogen isotpes. About `70%` of the universe is made up of hydrogen. d. Hydrogen is also present in coal, petroleium, vegetable and animal matter.
e. It is present in the earth's crust to an extent of `0.9%.`
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