most pure hydrogen is formed by?
1. 3Fe + 4h2o = fe3o4 + 4h2
2. NaBH4 + 2H2O = NaBO2 + 4H2
3. Ba(OH)2 = H2+O2
4. dilute H2SO4 = H2+O2
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Answer:1. 3Fe + 4h2o = fe3o4 + 4h2
Explanation:
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