Question

Which of the following statements about hydrogen is incorrect?

(a) Hydronium ion, H₃O⁺ exists freely in solution.

(b) Dihydrogen does not act as a reducing agent.

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

(d) Hydrogen never acts as cation in ionic salts.

Answer 1

The correct option is: (b) Dihydrogen does not act as a reducing agent.

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

Explanation:

Dihydrogen acts as a powerful reducing agent and reduces metal oxides such as CuO, ZnO, PbO and Fe₃O₄ to their respective metals.

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