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Hydrogen
Question
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Which of the following statement about hydrogen is incorrect?

  • Hydrogen never acts as cation in ionic salts

  • Hydronium ion, H3O+ exist freely in solution

  • Dihydrogen does not act as a reducing agent

  • Hydrogen has three isotopes of which tritium is the most common

Answer

C.

Dihydrogen does not act as a reducing agent

We can have both answers (C, D) 
For ionic salts, hydrogen never behaves as cation, but behaves as anion (H-)
H3O+ exist freely in solution
Dihydrogen acts as a reducing agent.
Hydrogen has three isotopes. Protium, Deuterium and Tritium. Protium is the most common isotopes of hydrogen with an abundance of 99.98%.

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