Study of the First Element - Hydrogen — CHEMISTRY STD 9 — Question
ICSE BoardEnglish MediumSTD 9CHEMISTRYStudy of the First Element - Hydrogen2 Marks
Question
State some sources of hydrogen.
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Answer
In the free state, hydrogen is found in traces in the earth's crust and atmosphere. In the combined state, plant and animal tissues are made of compounds of hydrogen with carbon, oxygen, and nitrogen.
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