Question

Which of the following statements about hydrogen is incorrect?

• A. Hydrogen has three isotopes of which tritium is the most common
• B. Hydrogen never acts as cation in ionic salts
• C. Hydronium ion, $H_3{O}^{+}$ exists freely in solution
• D. Dihydrogen does not act as a reducing agent

Answer 1

The correct option is A Hydrogen has three isotopes of which tritium is the most common

Hydrogen has three isotopes of which protium ${(}_1^{1}H)$ is the most common. The percent abundance of protium, deuterium and tritium are 99.985, 0.0156 and ${10}^{-15}$ respectively.