Chemistry
(a) Where does Hydrogen occur in free state?
(b) How did the name 'hydrogen' originate?
Hydrogen
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Answer
(a) In free state, hydrogen is found in traces in earth's crust and atmosphere. Volcanic gases contain 0.025% of it, the earth's crust 0.98%, the earth's atmosphere 0.01% and the atmospheres of the Sun and the stars also contain hydrogen in large amounts.
(b) It is on account of its ability to form water that Lavoisier, in 1783, named it hydrogen (Greek word meaning water former).
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(b) divalent metal
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