Which of the following statements about hydrogen is incorrect?

Options

A. Hydrogen never acts as cation in ionic salts
B. Hydronium ion, `H_3O^+` exists freely in solution
C. Dihydrogen does not act as a reducing agent
D. Hydrogen has three isotopes of which tritium is the most common

Answer

C, D

Explanation

For ionic salts, hydrogen never behaves as cation, but behaves as anion `(H^-)`
`H_3O^+` exists freely is solution
Dihydrogen acts as a reducing agent
Hydrogen has three isotopes.
Protium `(._1^1H)`
Deuterium `(._2^1H)`
Tritium `(._1^3H)`
Protium is the most common isotopes of hydrogen with an abundance of 99.98%.