#### Which of the following statements about hydrogen is incorrect? Option 1) Hydrogen has three isotopes of which tritium is the most common. Option 2) Hydrogen never acts as cation in ionic salts. Option 3) Hydronium ion, H3O+ exists freely in solution. Option 4) Dihydrogen does not act as a reducing agent.

As we learned in

Acidic Nature -

It is a weak acid turn blue litmus red only in pure state.

- wherein

Hydrogen has 3 isotopes Tritium, Deuterium and Protium of which Protium is the most common.

Option 1)

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

This option is correct

Option 2)

Hydrogen never acts as cation in ionic salts.

This option is incorrect

Option 3)

Hydronium ion, H3O+ exists freely in solution.

This option is incorrect

Option 4)

Dihydrogen does not act as a reducing agent.

This option is incorrect