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Question:

Which of the following statements about hydrogen is incorrect?

Hydrogen has three isotopes of which tritium is the most common

Hydrogen never acts as cation in ionic salts

Hydronium ion,H3O+exists freely in solution

Dihydrogen does not act as a reducing agent

Solution:

Hydrogen has three isotopes of which protium(¹H)is the most common. The percent abundance of protium, deuterium and tritium are 99.985, 0.0156 and 10⁻⁵⁵ respectively.